III International Symposium of Agricultural Sciences 2026

Join leading researchers, professionals, and students to explore the future of sustainable agriculture.

Early registration is $80 for members and $95 for non-members until March 9, 2026.

***The registration after March 9 is $120 for non-members and $100 for members***

The deadline to submit abstracts is March 9

Registration includes:
Fees for presenting in the symposium
Food provided during the event (Dinner, Lunch, and coffee breaks included)

How to register

1. Log in to your UAA-US account here (If you don’t have an account, create one here)

2. Click on the Early Registration Now Button below

3. Select one option: whether you want to attend or become a sponsor

4. Complete the payment procedure

5. You will receive a confirmation email

Once you complete your registration, you will get access to send your abstract

Date

March 26-27, 2026

Location

Griffin, Georgia

This agenda is only for reference and it is subget to change

If you would like a pdf version of the agenda click Agenda III International Symposium of Agricultural Sciences 2026

Time	Activity	Responsible
Noon-6:00 pm	Registration
1:30 pm – 5:00 PM	Tours (Food Science or USDA – TBD)
6:00 PM – 8:00 PM	Openning Ceremony


8:00 AM – 5:00 PM	Registration and collection of PowerPoint presentations
8:00 AM – 9:30 AM	Organization of posters	Presenters
8:00 AM – 8:30 AM	Coffee	Organizing Committee
	Technical Presentations – Division 1
8:30 – 8:45 AM	Fungicide Applications Amid Enforcement of the Endangered Species Act	Cesar Escalante – Purdue University
8:45 – 9:00 AM	Growth-Disrupting Insecticides as a Promising Strategy Against the Invasive Cotton Leafhopper	Sabrine Attia – University of Georgia
9:00 – 9:15 AM	Detection of Ramulariopsis Species Causing Areolate Mildew of Cotton in the Southeastern United States	Gabriel Dario Munoz Herrera – University of Georgia
9:15 – 9:30 AM	Corn Stunt and Curvularia Leaf Spot are Emerging Diseases in Minnesota	José Solórzano – University of Minnesota
9:30 – 9:45 AM	Spatial and Temporal Localization of Serratia ureilytica Causing Cucurbit Yellow Vine Disease in Cucurbits Indicates Phloem-Associated Colonization and Systemic Movement	Kensy Rodriguez-Herrera – Cornell University
9:45 – 10:00 AM	Auxin and Cytokinin Regulation of Somatic Embryogenesis in an Efficient In Vitro Regeneration System for Zoysiagrass (Zoysia spp.)	Esdras Carbajal – North Carolina State University
10:00 – 10:15 AM	Coffee Break
	Technical Presentations – Division 2	TBD
10:15 – 10:30 AM	Economic Analysis of Milling Yields and Net Returns for Selected Rice Varieties in Louisiana	Diana Amaya Discua – Louisiana State University
10:30 – 10:45 AM	Blooms & Beyond: Expanding Extension Impact in Horticulture	Ping Yu – University of Georgia
10:45 – 11:00 AM	Green Stormwater Infrastructure Demonstration Site	Martin Wunderly – University of Georgia
11:00 – 11:15 AM	Escape rooms: Breaking the mold for teaching agriculture	Brooklyne Wassel – University of Georgia
11:15 – 11:30 AM	Effect of Fertilizer Treatments on the Horticultural Performance of Aronia mitschurinii	Taiwo Adesiyan – University of Georgia
11:30 – 11:45 AM	The Art of Fish Dry-Aging and its Food Safety Gaps	Katheryn Parraga – Purdue University
11:45 AM – 12:00	Data-driven support for Hispanic swine farm workers: Results From the MU Extension–National Pork Board Partnership.	Magdiel Lopez-Soriano – University of Missouri
12:00 – 1:15 PM	Lunch break
	Technical Presentations – Division 3	TBD
1:15 – 1:30 PM	Evaluating the Accuracy of Genomic Selection for Fusarium Head Blight (FHB) and Yield Across Various Training Populations in Soft Winter Wheat	Lenin Rodriguez – University of Georgia
1:30 – 1:45 PM	Phylogenetic Relationship and Cross-Host Pathogenicity of Magnaporthe oryzae Isolates from Turfgrasses and Oats in the United States	Bochra Amina Bahri – University of Georgia
1:45 – 2:00 PM	Soil Fungal Diversity Across Land-Use Systems and Ecological Gradients in Honduras	Evelin Reyes – Louisiana State University
2:00 – 2:15 PM	The Effect of Pyrolysis Temperature and Incorporation Rate of Biochar on Mint and Lavender	Shuwen Luo – University of Georgia
2:15 – 2:30 PM	Recombinase Polymerase Amplification for Detection of Meloidogyne partityla and Evaluation of Nematicides for its Management in Georgia Pecan Orchards	Amisha Rimal – University of Georgia
2:30 – 2:45 PM	Integrated Nematode Management to Control the Reniform Nematode (Rotylenchulus reniformis) in Upland Cotton	Francisco Valle – Louisiana State University
2:45 – 3:00 PM	Screening Plant Samples in Georgia for HLB Using Real-Time PCR	Alejandra Jimenez -University of Georgia
	Poster Presentations
3:00 – 4:15 PM	Assessment of Pathogenicity and Aggressiveness of Fusarium poae on Wheat and Barley	Shiwarttan Kumar Gupt – University of Georgia
	Bee Abundance and Diversity on University of Georgia-Griffin Campus	Bodie Pennisi – University of Georgia
	Building Region-Specific Conservation Habitat Guidance for Georgia’s Working Lands	Madison Love – University of Georgia
	Calcium and Boron Concentration at Different Stages of Berry Development in ‘Farthing,’ ‘Brightwell,’ and ‘Powderblue’ Blueberry Cultivars	Lilian Carcamo – University of Georgia
	Can Blue Light Replace Fungicides? Evaluating a Novel Turfgrass Disease Control Strategy	Susmita Sigdel – University of Georgia
	Early Ecophysiological Indicators of Native Tree Establishment Under Low-Maintenance Reforestation	Tiana Deeb – University of Georgia
	Evaluation of Soybean Varieties for Resistance to Root-Knot Nematode (Meloidogyne incognita) in Louisiana	Iris Aguilar – Louisiana State University
	Integrating race profiling, gene copy variation, and effector knockouts to decode Fusarium oxysporum f. sp. niveum virulence in watermelon	Fiama Guevara – University of Georgia
	Genetic Architecture of Specialized Metabolite Resistance in Botrytis cinerea	Melanie Madrigal – Louisiana State University
4:15 – 5:00 PM	UAA-US Bussiness meeting
5:00 PM	Adjourn

Leonardo Lombardini, PhD - Professor and Head, Department of Horticulture, University of Georgia

Dr. Leonardo Lombardini specializes in plant physiology, gas exchange, and plant responses to environmental stress. He earned his Laurea in Forestry from the Università degli Studi di Firenze (1993) and a Ph.D. in Horticulture from Michigan State University (1999). After a postdoc at Washington State University studying cultural practices in apple and pear trees, he joined Texas A&M University, where he was a faculty member from 2002 to 2019 with a focus on pecan research. In 2016, he founded the Center for Coffee Research and Education at Texas A&M University. He has authored/coauthored 65 refereed publications, generated over $1 million in grants, and given over 100 presentations at professional and research meetings worldwide. He has taught undergraduate and graduate course in areas of plant physiology, global agricultural issues, and professional development in horticulture. In 2019, he was named Head of the Horticulture Department at the University of Georgia.

Abstract Submission Guidelines

Abstract Title
- 150 characters maximum including spaces
- Capitalize only the first letter of the first word and any proper nouns
- Symbols (Greek, math, etc.) must be spelled out, e.g., Beta

Participation Type
- Specify preference for an oral or poster presentations. All abstracts will be reviewed by the committee board (Leonardo Salgado & Lenin Rodriguez)
- The abstract must be edited and proofed for all the authors prior to submission.

Abstract Text
- The abstract must be in one paragraph with a maximum of 250 words in length and written in English.
- Do not include titles, authors, or addresses in the text of the abstract.
- The abstract must answer the following questions: What is the problem? What has been done? What did you discover? What do the findings mean?

Oral Presentations
- Acceptance as an oral, and applicable presentation date and time, will be announced later.
- There is a limit of one oral presentation presenter.

Submit Your Abstract

Once you complete your registration, the submission form will be available for you below

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Abstracts for oral and poster presentations

Fungicide Applications Amid Enforcement of the Endangered Species Act

Presented by: César Escalante

Department of Botany and Plant Pathology, Purdue University, West Lafayette, 47907, IN, USA

Email: escalac@purdue.edu

Abstract: Watermelon (Citrullus lanatus) production in the United States was valued at $787 million in 2023, with most production concentrated in Florida, California, and Georgia. In the Midwest, Indiana leads watermelon production with an annual value of $49 million. These specialty crops rely heavily on intensive spray programs to manage major diseases. However, implementation of the Endangered Species Act (ESA) may limit the use of several commonly applied active ingredients for fungal disease management. As a result, it is critical to explore effective alternatives amid these new ESA regulations. Some current go-to products may soon face restrictions, expanded buffer zones, or even cancellation. To prepare for a future with a potentially smaller toolbox of synthetic options, we evaluated both standard synthetic fungicides and biopesticides for the management of gummy stem blight (GSB) and anthracnose of watermelon. OR-009EPA alone (Appeal) and the standard program (Bravo/Inspire Super) maintained GSB severity at approximately 32-33%, substantially lower than the non-treated control (71%). Similar trends were observed when comparing biological products and synthetic chemistries used to manage anthracnose. The future of vegetable disease management will require integrated strategies and increased regulatory awareness. This presentation will highlight efficacy results and provide growers with rotation data to help them remain productive under evolving ESA-driven constraints.

Growth-Disrupting Insecticides as a Promising Strategy Against the Invasive Cotton Leafhopper

Presented by: Sabrine Attia^1,2, and Shimat V. Joseph¹

¹Department of Entomology, University of Georgia, 1109 Experiment Street, Griffin, GA 30223 USA; svjoseph@uga.edu; ORCID: 0000-0002-3686-0024

²Laboratory of Bioaggressors and Integrated Pest Management in Agriculture (LR14AGR02), National Agronomic Institute of Tunisia (INAT), 43 Avenue Charles Nicolle, Cité Mahrajène 1082, University of Carthage, Tunisia; sabrine.attia@inat.ucar.tn; ORCID: 0000-0002-1896-6298

Email: sabrine.attia@uga.edu

Abstract: Invasive phytophagous insects are increasingly disrupting agroecosystems worldwide, particularly when their life cycles include rapid development and concealed immature stages that hinder effective control. The two-spotted cotton leafhopper, Amrasca biguttula (Ishida) (Hemiptera: Cicadellidae), recently detected in the United States, represents a potential threat to cotton, vegetable, and ornamental crops. Sustainable management strategies are therefore needed to limit the establishment and spread of this pest. This study investigated the effects of several reduced-risk insecticides that interfere with insect growth and development on different life stages of A. biguttula. Bioassays were conducted using leaf-dip and adaxial leaf smear techniques to evaluate their impact on survival, molting success, and longevity of early, intermediate, and late nymphal instars, as well as adults. The tested compounds produced significant lethal and sublethal effects that varied according to developmental stage. Younger nymphs were generally more susceptible, exhibiting high mortality rates, disrupted molting processes, and reduced longevity after exposure. In contrast, later developmental stages and adults were less affected, indicating that treatment timing may strongly influence control efficacy. The addition of spray adjuvants slightly enhanced treatment performance but did not substantially modify overall outcomes. These findings demonstrate that insecticides targeting growth and metamorphosis can strongly interfere with the population development of A. biguttula. Their stage-specific effects highlight the importance of targeting early instars and support the integration of these compounds into sustainable integrated pest management programs designed to mitigate the impact of this invasive leafhopper in affected cropping systems.

Detection of Ramulariopsis species causing areolate mildew of cotton in the Southeastern United States

Presented by: Gabriel Dario Munoz Herrera¹ , Tessie Wilkerson² , Tom W. Allen2 , Heather M. Kelly³ , Ian Small⁴ , Robert Kemerait¹, and Alejandra Jimenez Madrid¹ ,

¹Department of Plant Pathology, University of Georgia, Tifton GA 31794

²Mississippi State University, Delta Research and Extension Center, Stoneville MS, 38776

³Department of Entomology and Plant Pathology, University of Tennessee, Jackson, 38301

⁴Department of Plant Pathology, North Florida Research and Education Center, University of Florida, 32351

Email: gabriel.munozherrera@uga.edu

Abstract:Areolate mildew is a reemerging disease in the United States and is a concern in cottonproducing states. Ramulariopsis gossypii was reported as the causal agent of AM since its first observation in Alabama in 1890. A second species, R. pseudoglycines, was reported in 2016, causing the same symptoms/signs of AM in Brazil. In fact, R. pseudoglycines is the predominant species in Brazilian cotton fields today. This new species was reported for the first time in the US in 2023. However, the prevalence of the Ramulariopsis species in the southeastern region was unknown. Therefore, a survey was launched in 2024 and continued in 2025, with the collaboration of specialists from Florida, Georgia, Mississippi, and Tennessee. Symptomatic cotton leaves were collected by the State Specialists during August and September and sent to The Plant Molecular Diagnostics Lab at the University of Georgia. Conidia were inspected under microscope and fungal isolation was conducted in V8 medium. In 2025, a total of 62 isolates were recovered from FL(n=12), GA(n=20), MS(n=22), and TN(n=8). DNA was extracted and the species was identified by sequencing the EF1-alpha gene. Of those, 58 isolates were confirmed as RP across all states and four FL isolates were identified as RG with a 99.7% identity. AM in the Southeastern US is caused predominantly by RP (94% of isolates), while RG remains limited to FL (6% of isolates). The isolation of both species from the same symptomatic leaves from FL may indicate a potential coexistence or complex of species.

Corn Stunt and Curvularia Leaf Spot are Emerging Diseases in Minnesota

Presented by: José E. Solórzano

University of Minnesota, Department of Plant Pathology

Email: ortiz432@umn.edu

Abstract: Corn (Zea mays L.) is an economically important commodity in Minnesota. The emergence of new diseases in this production system poses a potential risk to yield stability and management. Recently, two diseases not previously reported in Minnesota corn were detected. Corn stunt was first found in Minnesota in 2024, following an increase in reports across the United States. Different mollicutes and viruses can cause the disease, but symptoms recently observed in Minnesota and other regions in the U.S. were associated with the corn stunt spiroplasma Spiroplasma kunkelii and its vector Dalbulus maidis. Detection of the disease in the upper U.S. Midwest suggests an expansion of the pathogen and its vector into new environments, as the disease has historically been found in warmer corn-producing regions of the Americas, including the southern United States. In addition, Curvularia leaf spot, caused by the fungus Curvularia lunata, was first detected in Minnesota corn fields in 2025 at low incidence and disease severity. The effects of both diseases on corn production in Minnesota have not yet been assessed, but they may pose a significant threat if environmental conditions and host susceptibility favor disease development. Efforts are underway to evaluate the potential risks these diseases pose to corn production in the state.

Spatial and temporal localization of Serratia ureilytica causing cucurbit yellow vine disease in cucurbits indicates phloem-associated colonization and systemic movement

Presented By: Kensy D. Rodriguez-Herrera, Elise Boisvert, Margaret H Frank, and Christine D. Smart

Email: kdr66@cornell.edu

Abstract: Cucurbit yellow vine disease (CYVD), caused by the bacterium Serratia ureilytica, is a phloemassociated disease of cucurbits. This study characterized the spatial and temporal distribution of S. ureilytica in Cucurbita pepo cultivar ‘Delicata’ plants under greenhouse conditions using a GFP-tagged isolate (P01). Seedlings were sampled weekly for four weeks. Transverse sections from the stem, petiole, leaf, shoot apex, and root were imaged by laser scanning confocal and fluorescent dissecting microscopy. In parallel, bacterial abundance in each plant tissue was assessed by quantifying colony-forming units (CFU) via droplet plating over a 4-week time course. Across plant tissues and time points, S. ureilytica fluorescent signal was primarily concentrated in the inner and outer periphery of the bicollateral vascular bundles, with higher magnification images revealing mainly symplastic localization within phloem-associated cells. Consistent with the imaging results, bacterial quantification data showed a high abundance of CFUs in the main stem across weeks, with an irregular pattern of presence in the distal tissues at later time points. These results suggest that S. ureilytica is predominantly localized within phloem-associated cells and spreads both acropetally and basipetally during infection.

Auxin and Cytokinin Regulation of Somatic Embryogenesis in an Efficient In Vitro Regeneration System for Zoysiagrass (Zoysia spp.)

Presented By: Esdras Carbajal and Susana Milla-Lewis

North Carolina State University

Email: emcarbaj@ncsu.edu

Abstract: Advances in genetic engineering and genome editing offer powerful opportunities for turfgrass improvement by enabling the introduction of novel genetic variation beyond that found in natural populations. The successful application of these technologies relies on the development of reliable and reproducible plant tissue culture systems. Optimizing regeneration protocols is essential to support efficient transformation and gene-editing strategies. In this study, factors influencing callus initiation, proliferation, and somatic embryogenesis were evaluated in Zoysia spp. Mature seeds were cultured on Murashige and Skoog basal medium supplemented with factorial combinations of auxin and cytokinin. The combination of 1.5 mg L⁻¹ 2,4-D with 0.05 mg L⁻¹ 6-BA produced the highest callus induction frequency (67%). Auxin levels (2 mg L⁻¹ 2,4- D) combined with low cytokinin (0.01 mg L⁻¹ 6-BA) also supported vigorous callus growth and sustained proliferation during subculture. Regeneration experiments indicated that gibberellic acid influenced embryo conversion, with 0.5 mg L⁻¹ GA₃ increasing the number of regenerated plantlets. The optimized protocol enabled plant recovery within approximately five months while minimizing the need for frequent subculturing. This reproducible system provides a practical foundation for Zoysia tissue culture and supports future studies involving somaclonal variation, genetic transformation, and genome editing aimed at developing improved turfgrass cultivars.

Economic Analysis of Milling Yields and Net Returns for Selected Rice Varieties in Louisiana

Presented By: Diana Amaya-Discuaa, Michael Deliberto

Department of Agricultural Economics and Agribusiness, Louisiana State University, Baton Rouge, Louisiana.

Email:damaya5@lsu.edu

Abstract: Rice producers face increasing net return risk due to declining prices, rising production costs, and variability in milling quality that affects marketable yield and revenues. This study evaluates the risk-adjusted profitability of selected long-grain rice varieties by jointly considering variability in rough rice yield and milling quality. The analysis uses Louisiana Rice Variety Trial data from 2014–2024 on grain yield averaged across nine locations and milling percentages (head rice and total milling yield), together with historical rough rice prices, to simulate milling-adjusted revenues and net returns for seven varieties under a main-crop-only framework reflecting 2025 price and cost conditions. Net returns (per acre) were compared using Stochastic Efficiency with Respect to a Function (SERF), a risk-analysis approach that ranks alternatives based on both expected returns and producers’ tolerance for downside risk. Results show that Mermentau and Cheniere varieties dominate alternative varieties across risk-aversion levels, with higher certainty equivalents and lower probabilities of unfavorable outcomes. In contrast, CL111 shows a higher downside risk and is consistently least preferred. These findings highlight that high rough rice yield alone does not guarantee economic performance and underscore the importance of incorporating milling quality and risk considerations into variety selection decisions under tight margin conditions.

Blooms & Beyond: Expanding Extension Impact in Horticulture

Presented By: Ping Yu

University of Georgia

Email: pingyu@uga.edu

Abstract: A podcast is an on-demand digital audio (and sometimes video) series, where audience can listen anytime, anywhere. Podcasts are emerging as popular format for discussing science. In horticulture, we are facing challenges such as the loss of student enrollment, the unawareness of this subject etc. While podcast format serves an important role, very few horticulture podcasts focus on delivering horticulture sciences to a larger audience. With the aim of disseminating science-based information to the stakeholders, increasing the awareness of horticulture and helping the public see the plant power through different aspects of life, the “Blooms and Beyond” podcast was created. Since launched in mid-November 2025, the podcast has released 6 episodes with topics ranging from resources from top industrial organizations, international plant hunting, basics of integrated pest management, as well as shortening peonies production cycle with improved quality by using PRGs, provided tangible information to the stakeholders as well as intriguing stories for the public.

Green Stormwater Infrastructure Demonstration Site

Presented By: Martin Wunderly(1) , Rolando Orellana(2)

1. UGA Extension, Area Water Agent, Northeast District, 1420 Experiment Station Rd, Watkinsville, GA 30677, martin.wunderly@uga.edu

2. UGA College of Agriculture and Environmental Sciences, Urban Water/Irrigation Management, 1109 Experiment St, Griffin, GA 30223, jrolando@uga.edu

Email: martin.wunderly@uga.edu

Abstract: Stormwater runoff from impervious surfaces such as roofs, parking lots, and roads causes soil erosion, water pollution, and flooding in streams and rivers. These impacts damage infrastructure, degrade aquatic habitats, and increase costs for communities that must manage excess stormwater. The University of Georgia Center for Urban Agriculture received funding from the Georgia Environmental Protection Division, UGA Griffin, and UGA Structural Pest Management to support a green stormwater infrastructure demonstration site at the UGA Griffin Research and Education Gardens in Griffin, GA. This site showcases practical, research-based solutions that can be replicated in residential, commercial, and municipal landscapes. Green stormwater infrastructure is an alternative approach to stormwater control that reduces rainfall runoff from developed landscapes using plants, soils, and engineered materials. The stormwater demonstration site is available for public viewing, along with a self-guided web page resource that describes the purpose, function, and design of each green infrastructure practice. The demonstration site has served as a training facility for regional landscape industries, municipal managers, and other professionals to learn about design, installation, and maintenance of these practices. Participants use the training to expand stormwater management services for their clientele, support regulatory compliance, and promote more resilient, sustainable communities.

Escape rooms: Breaking the mold for teaching agriculture

Presented By: Wassel, B.M.(1) , Johnson, A.F.(2)

1University of Georgia, Cooperative Extension Pike County, Meansville, GA, 30256, brooklyne.wassel@uga.edu

2University of Georgia, Cooperative Extension Dade County, Trenton, GA, 30752, ajohns14@uga.edu

Email: brooklyne.wassel@uga.edu

Abstract: Georgia’s agricultural industry is critical to the economic health of the state and is innately tied to the ability of clients to obtain and maintain Private and Commercial Pesticide Applicator Licenses. Plant protection tools available through these licensure programs are some of the only options to manage pests and maintain profitable agricultural commodities in the state. The certification and education provided by UGA Extension allows farmers to take self-empowerment in protecting their crops and rangelands, if able, saving them costs associated with pesticide contractors. Additionally, Extension emphasizes and delivers programs that focus on pesticide safety, which is paramount to protect these pesticide handlers and applicators, as well as Georgia residents, non-target organisms, and other natural resources. While understanding and interpreting the pesticide label is the foundation of safe and legal pesticide use, traditional lecture-based programs alone can be difficult to maintain engagement among experienced applicators who use these tools regularly. Pesticide labels are a critical and legally binding piece of information often left unread or ignored, therefore incorporating an interactive activity into programming requires participants to interact with the label to solve problems, while promoting active learning and increasing engagement. Tabletop escape rooms with pesticide safety content have engaged with 58 participants to teach and reinforce pesticide safety standards and pesticide label understanding. Participants were actively learning, communicating, and reinforcing their knowledge. Transitioning from lecture-only format to an active learning module has the potential to help with client retention and increase post-program knowledge gain.

Effect of Fertilizer Treatments on the Horticultural Performance of Aronia mitschurinii

Presented By: Taiwo Adesiyan¹, Bodie Pennisi¹, Rachel Itle², and Leynar L. Naranjo³

^1,2Department of Horticulture, University of Georgia, 1109 Experiment Street, Griffin GA 30223

³Department of Environmental Horticulture, University of Florida, Institute of Food and Agricultural Sciences, North Florida Research and Education Center. 

Email: taiwo.adesiyan@uga.edu

Abstract: We evaluated the effects of fertilizer treatments on the horticultural performance of Aronia mitschurinii (‘Viking’) grown under field conditions in Georgia, to identify optimal fertilizer rates for plant growth, yield, and fruit quality. Viking is a cold-hardy, nutrient-dense berry with high antioxidant content and increasing commercial interest in the southeastern United States. However, limited agronomic information exists regarding its fertilizer response under Georgia’s climatic conditions. Understanding fertilizer effects on growth and fruit quality parameters, including berry size, yield, pH, total soluble solids (TSS), and titratable acidity (TTA) is essential for developing regionally adapted production guidelines. A field experiment was established in 2023 at Mercier Orchards, a commercial farm in Blue Ridge, Georgia (USDA Zone 7a), using a randomized complete block design with four fertilizer treatments: 0, 6, 12, and 18 g N/plant. Nature Safe All-Season Fertilizer (10-2-8) was applied in split applications in May and July 2024. Measured parameters included growth index, berry size (mm), berry weight (g), dry weight of 100 g berries, and yield per plant (g/plant). Fruit quality attributes, including TSS (°Brix), TTA (%), and pH, were also evaluated. Fertilizer treatment significantly influenced vegetative growth, with the 12 g N/plant treatment producing a significantly higher growth index compared to the unfertilized control. Berry size and berry weight were not significantly affected by fertilizer rate. Yield did not differ significantly among treatments; however, the 12 g N/plant treatment produced the highest numerical yield, with a 45% increase over the control. Total soluble solids and titratable acidity were not significantly affected by fertilizer treatment, while fruit pH varied significantly between fertilized and unfertilized plants. Overall, moderate fertilizer application (12 g N/plant) supported improved vegetative growth and yield trends while maintaining stable fruit quality. These findings suggest that A. mitschurinii grown under Georgia conditions responds favorably to moderate fertilizer inputs and underscore the importance of developing region-specific fertilizer recommendations.

The Art of Fish Dry-Aging and its Food Safety Gaps

Presented By: Katheryn Parraga

Purdue University

Data-driven support for Hispanic swine farm workers: Results From the MU Extension–National Pork Board Partnership.

Presented By: Magdiel Lopez-Soriano*†, Talita P. Resende∆, Andréia G. Arruda‡ , Magnus R. Campler‡ , Isaiah Franco§ , Kara Flaherty‡ , Anna K. Johnson# , Monique Pairis-Garcia|| , Samira Chatila¶ , Maria Pieters¶ , Pedro Urriola¶ , Kelly L. Adams$ , Nahida Begum$ , Douglas Jackson-Smith§ , Timothy J. Safranski†

† Extension Department- Swine, University of Missouri, Columbia, Missouri, U.S.A., 65211.

∆College of Food, Agriculture, and Environmental Sciences, The Ohio State University, Wooster, Ohio, U.S.A. 44691.

‡ College of Veterinary Medicine, The Ohio State University, Columbus, Ohio, U.S.A., 43210.

§ School of Environment and Natural Resources, The Ohio State University, Wooster, Ohio, U.S.A. 44691.

# Department of Animal Science, Iowa State University, Ames, Iowa, U.S.A. 50011.

||Department of Population Health and Pathobiology, NC State University, Raleigh, North Carolina, U.S.A. 27606.

¶ Department of Veterinary Population Medicine, University of Minnesota, St. Paul, Minnesota, U.S.A. 55108.

$ Assessment Resources Center, College of Education & Human Development, University of Missouri, Columbia, Missouri, U.S.A., 65211.

Email: mlopezsoriano@missorui.edu

Abstract: Labor shortages continue to be one of the most common problems facing the U.S. swine industry. As a result, producers are increasing their reliance on recruiting highly skilled Hispanic workers via the TN‑visa program. In collaboration with the National Pork Board (NPB), MU Extension conducted a bilingual, multi-state survey of 261 TN‑visa workers to gain insight into their cultural background, workplace experience, satisfaction, retention, and factors affecting their job satisfaction level. Survey results show that almost all of the TN‑visa workers have at least a bachelor’s degree, with the majority having degrees in agriculture before immigrating to the U.S. The three main motivations for these employees were higher wages, the opportunity to provide for their families, and wanting to develop professionally. Approximately 70% of the TN‑visa workers reported being satisfied with their jobs, and cited as reasons: positive working conditions, supportive coworkers, and opportunities for advancement. Dissatisfied employees were typically dissatisfied with poor management, an unbalanced workload, and the absence of co-worker communication, which were identified as factors contributing to the stress level and intention to turnover. Throughout this research, the highlighted areas of improvement for providing culturally competent management, access to core benefits such as health care and retirement, bilingual training material, and structured leadership development are critical elements producers can implement. This information provides ways to improve employee job satisfaction, decrease employee turnover rates, and develop a reliable skilled workforce that are necessary to keep up with productivity levels in the U.S. pig producer’s industry

Evaluating the accuracy of genomic selection for Fusarium Head Blight (FHB) and yield across various training populations in soft winter wheat

Presented By: Lenin Rodriguez(1) , Nelly Arguello-Blanco2 , Carlos Ignacio2 and Clay Sneller(2)

1 UGA Grand Farm, University of Georgia, Perry, GA, 31069.

2 Department of Horticulture and Crop Science, The Ohio State University, Wooster, OH, 44691

Email: lenin.rodriguez@uga.edu

Abstract Fusarium head blight (FHB) and yield are two critical traits in wheat breeding because they strongly influence grain quality and productivity. FHB is a destructive disease that can cause substantial and quality losses, while improving yield remains a primary objective in breeding programs. Both traits are quantitatively inherited, making phenotyping expensive and timeconsuming. Genomic selection (GS) offers a potential alternative to early-stage phenotyping, but reducing the training population (TP) size and diversity may affect prediction accuracy. This study evaluated how the number of years of data included in the TP and the removal of stage-1 phenotyping (the first year of yield testing) influence GS accuracy for FHB and yield. Data from 5,096 lines evaluated for FHB and 5,872 lines evaluated for yield across six years in a soft winter wheat breeding program were used. Five prediction populations were created for FHB and yield using different combinations of years (one to five years for FHB and one to eight years for yield), both including and excluding stage-1 data. Results showed that excluding stage-1 phenotyping did not reduce GS accuracy for FHB or yield. Increasing the number of years in the TP improved prediction accuracy for all traits. The highest GS accuracy for FHB was achieved using five years of data, whereas eight years produced the most accurate predictions for yield. These results suggest that stage-1 phenotyping may be removed for FHB and yield without compromising prediction accuracy. Overall, incorporating multi-year data improves the reliability of genomic predictions in wheat breeding.

Phylogenetic Relationship and Cross-Host Pathogenicity of Magnaporthe oryzae Isolates from Turfgrasses and Oats in the United States

Presented By: Bochra A. Bahri1,2 , Harshita Saxena1,3, Mark L. Farman3 , Alfredo D. Martinez-Espinoza2 , Phillip L. Vines4 , Zhenbhang Chen1,4, Samikshya Rijal1 , Paul L. Raymer1,4

1 Institute of Plant Breeding, Genetics, and Genomics, University of Georgia

2 Department of Plant Pathology, University of Georgia

3Department of Plant Pathology, University of Kentucky

4Department of Crop and Soil Sciences, University of Georgia

Abstract: Magnaporthe oryzae is a fungal pathogen of grasses in the Poaceae family, posing serious risks to agricultural crops and turfgrass systems. Its rapid evolution complicates disease control and breeding for resistance. While this pathogen has been extensively studied in rice, infections on non-rice hosts, particularly turfgrasses and oats, have become an increasing concern in the United States. In this study, we investigated the phylogenetic relationships of 15 M. oryzae isolates collected from turfgrasses and oats. We also evaluated the pathogenicity of three isolates (As_GA_GLS, Fa_GA_GLS, and Fa_MO_GLS) across 13 Poaceae species. Pathogenicity assays revealed differences in virulence among isolates. Disease severity was greatest on cool-season turfgrasses and cereals, whereas warm-season turfgrasses showed significantly lower disease. Wholegenome phylogenetic analysis with 211 reference genomes identified distinct host-associated lineages. Isolates Fa_GA_GLS and Fa_MO_GLS grouped within a Festuca-specific clade, while As_GA_GLS clustered within the Lolium lineage, despite being collected from Avena. Phylogenetic analysis using 11 housekeeping genes supported these classifications and clarified the placement of the remaining 12 isolates from turfgrasses into well-defined clades. Overall, these findings highlight the lineage structure and virulence patterns within M. oryzae, providing valuable insights for developing effective resistance and disease management strategies in turfgrass and cereal production systems.

Soil fungal diversity across land-use systems and ecological gradients in Honduras

Presented By: Evelin Y. Reyes-Mendez1 , Cleber Ten Caten, Pedro Santos, David Galo, Daijiang Li, and Jordan Dowell1

Email: ereye11@lsu.edu

Abstract: Soil fungi play a fundamental role in ecosystem health, nutrient cycling, and plant productivity, yet they remain understudied across tropical landscapes in Honduras. In this study, we investigated how land-use practices and ecological gradients shape soil fungal communities across four regions of Honduras: Danlí, Catacamas, Tegucigalpa, and La Esperanza. We collected soil samples from natural areas, organic farms, and non-organic farms, and used ITS and SSU/18S metabarcoding on the Illumina MiSeq platform to characterize fungal diversity and community composition. We expected both land management and environmental variation to influence fungal assemblages across sites. Our results showed that 35.1% of OUT Swere shared across all three land-use types, suggesting the presence of a core soil fungal community across Honduran landscapes. At the same time, natural areas supported the highest proportion of unique OTUS (17.3%), followed by organic farms (13.5%), while non-organic farms showed the lowest proportion of unique OTUS (3.6%). These patterns indicate that land use influences fungal community structure, with natural and lower-impact systems contributing more strongly to unique fungal diversity. This project also highlights the importance of collaboration with local researchers, students, municipalities, and Indigenous communities to promote reciprocal knowledge exchange and support conservation and sustainable land management. Overall, this study emphasizes that conserving diverse soil fungal communities is important for ecosystem resilience and agricultural sustainability in tropical landscapes.

The Effect of Pyrolysis Temperature and Incorporation Rate of Biochar on Mint and Lavender

Presented By: Shuwen Luo*1 , Yan Zhang1 , Lilin Chen1 and Ping Yu1

1 115 Cowart Building, Department of Horticulture, University of Georgia, Griffin Campus, Griffin, GA 30223

Email: Shuwen.Luo@uga.edu

Abstract: Biochar is a carbon-enriched material produced by the pyrolysis of biomass, which has received increasing attention as a sustainable substrate amendment in horticultural production. Researches showed that biochar pyrolysis temperature alters its physicochemical properties, thereby influencing plant performance. However, the effects of pyrolysis temperature and biochar application rate on plant growth remain inconsistent across species.We conducted a greenhouse experiment to evaluate the combined effects of biochar application rate and pyrolysis temperature on substrate properties, physiology, and production of mint (Mentha sp. ‘Mojito’) and lavender (Lavandula × intermedia ‘Phenomenal’). Three biochars produced at standard temperature (around 550 °C), 500 °C, and 650 °C were incorporated into a commercial substrate at multiple volumetric rates (0, 20, 40, 60, 80%) and tested in a greenhouse experiment using a randomized complete block design. Results showed that both pyrolysis temperature and incorporation rate significantly altered substrate pH and EC, producing distinct growth and physiological responses in mint and lavender. Photosynthesis measurements in mint revealed that biochar rate and pyrolysis temperature can significantly effect net photosynthesis, stomatal conductance and transpiration. In conclusion, this study provides a guidance of how to use biochar in mint and lavender: low biochar incorporation rates (20%) with standard pyrolysis temperature (around 550°C) yielded the best growth performance in mint, while lavender showed optimal growth at 500°C with moderate biochar rates (40%).

Recombinase polymerase amplification for detection of Meloidogyne partityla and evaluation of nematicides for its management in Georgia pecan orchards

Presented By: Amisha Rimal1 , Intiaz A. Chowdhury1 , Timothy B. Brenneman1 , Ganpati Jagdale2 , Clemen Oliveira1 and Alejandra Jimenez Madrid1

1Department of Plant Pathology, University of Georgia, Tifton, GA 31793, U.S.A

2 Department of Plant Pathology, University of Georgia, Athens, GA 30601, U.S.A

Email: Corresponding author: Alejandra Jimenez Madrid (a.jimenez@uga.edu )

Abstract: Pecan (Carya illinoinensis) is one of the most economically important crops grown in Georgia, contributing about one-third of U.S. pecan production. In recent years, the pecan root-knot nematode, Meloidogyne partityla, has become a significant threat to pecan production. First reported in Georgia in 2002, M. partityla is now the dominant root-knot nematode species in many pecan orchards across the state. Accurate and rapid detection of this pathogen is essential for management. In this study, a recombinase polymerase amplification (RPA) assay was developed for rapid detection of M. partityla targeting the internal transcribed spacer region. The RPA assay detected DNA from a single adult female nematode at 39 °C within 20 minutes using the AmplifyRP XRT+ Kit. The assay showed high sensitivity, detecting one-hundredth of DNA from a single female nematode, and high specificity with no amplification for other Meloidogyne spp. After accurate identification, root-knot nematodes can be managed using nematicides. To evaluate nematode management, an on-farm experiment was conducted in Houston County, Georgia, assessing the efficacy of nematicides including fumigants (Telone and Telone C-35) and nonfumigant nematicides (Velum, Nimitz, Movento) applied alone or in combination. Treatments were arranged in a randomized complete block design, and plant vigor and nematode densities were monitored from 2022 to 2025. All treatments improved tree growth compared to the untreated control. Pre-plant Telone followed by Velum Prime at planting provided the most effective suppression of M. partityla. These findings highlight the potential of integrating fumigant and nonfumigant nematicides for effective nematode management in pecan orchards.

Integrated Nematode Management to Control the Reniform Nematode (Rotylenchulus reniformi s) in Upland Cotton

Presented By: Francisco Valle¹ and Tristan Watson¹

¹ Department of Plant Pathology, Louisiana State University, Baton Rouge, LA 70802, U.S.A.

Email: Fvalle@agcenter.lsu.edu

Abstract: The reniform nematode (Rotylenchulus reniformis) is a major pest of upland cotton (Gossypium hirsutum) in the U.S. Cotton Belt, causing significant yield and lint quality losses. In Louisiana, yield losses due to reniform nematode were approximately 2.25% in 2025, costing producers approximately $2.2 million dollars. Management has primarily relied on crop rotation and nematicides, but recent commercialization of reniform nematode-resistant cotton cultivars offers new opportunities to combine host resistance with chemical control in infested fields. This study aimed to evaluate the effectiveness of combining resistant cotton varieties with various nematicide chemistries (fluopyram, aldicarb, and abamectin) for suppression of reniform nematode populations and enhancement of lint yield in infested Louisiana fields. Field trials were conducted in 2024 and 2025 at two locations with reniform nematode infestations. Results showed that the resistant variety (PHY 411 W3FE) generally supported lower nematode soil population densities than the susceptible variety (PHY 340 W3FE), regardless of nematicide treatment. Integrated treatments combining the resistant variety with nematicides yielded higher lint production than the untreated susceptible control under high nematode pressure, suggesting potential yield-protection advantages. However, these benefits were not consistent across all fields tested. Ongoing field experiments aim to verify treatment effects and explore interactions among host resistance, nematicides, and the future integration of crop rotation.

Screening Plant Samples in Georgia for HLB Using Real-Time PCR

Presented By: Alejandra Jimenez

University of Georgia

(Poster) - Assessment of pathogenicity and aggressiveness of Fusarium poae on wheat and barley

Presented By: Shiwarttan K. Gupt1 , Bikash Ghimire2 , Alfredo D. Martinez-Espinoza1 , Jake C. Fountain, James W. Buck1*

1Department of Plant Pathology, Griffin Campus, University of Georgia, Griffin, GA

2Department of Plant Pathology, Athens Campus, University of Georgia, Athens, GA

Email: skg14221@uga.edu

Abstract: Fusarium head blight (FHB), primarily caused by Fusarium graminearum, poses a major threat to wheat and barley production. Although Fusarium poae is increasingly reported in cerealgrowing regions worldwide, its pathogenic potential in U.S. wheat and barley remains underexplored. We compared the pathogenicity and aggressiveness of four F. poae isolates (GA18W 2.1.6, GA18W 5.2.4, GA18W 6.1.4, GA19W 13.2.1II) and one reference F. graminearum isolate (GA18W 3.1.4) across seven cultivars (three soft red winter wheat, two durum wheat, two barley) classified as moderately resistant or susceptible. Greenhouse evaluations were conducted in 2021, 2022, and 2024 using single floret inoculation (SFI) and direct spray (DS). Disease severity (SEV), Fusarium damaged kernels (FDK), and thousand kernel weight (TKW) were assessed. Main effects of isolate, cultivar, and inoculation method were significant for SEV, FDK, and TKW (P < 0.0001). As no consistent isolate-level differences were detected among the four F. poae isolates, data were pooled for species-level analysis. Across cultivars, methods, and years, F. graminearum GA18W 3.1.4 produced higher SEV (47–63%) and FDK (54– 76%) and reduced TKW (to 18 g) relative to pooled F. poae (SEV 14–36%; FDK 32–56%; TKW up to 24 g), with the greatest impacts in durum wheat. These results demonstrate that F. poae can contribute to FHB in U.S. small-grain cereals and support consideration of this species in resistance screening programs.

(Poster) - Bee Abundance and Diversity on University of Georgia-Griffin Campus

Presented By: Bodie Pennisi, Vincent J. Dooley Endowed Professor of Ornamental Horticulture, Dept. of Horticulture, 1109 Experiment St, Griffin, 30223

Conor Fair, Assistant Research Scientist in Applied Statistics, CAES, Griffin, 30223

Madison Love, Graduate Research Assistant, Dept. of Horticulture, 1109 Experiment St, Griffin, 30223

Email: bpennisi@uga.edu

Abstract: Pollinators broadly and bees specifically, are the target of considerable research with the goal of preventing species loss and protecting biodiversity. Strategic conservation can impact bee communities visiting landscape spaces and help mitigate pollinator decline. However, planning effective conservation strategies requires understanding how local communities vary in space and time in the urban and suburban context. In this study, we assessed the spatiotemporal changes in the composition of bee communities on the University of Georgia-Griffin Campus (120 acres). We deployed 3-color bowl traps at five locations spaced approximately 600 ft apart, from March to October over 2 yr. We identified 81 species across 23 genera. The most common were Andrena morrisonella (Andrenidae), Agapostemon virescens, Halictus ligatus, Lasioglossum coreopsis, Lasioglossum hithensi, and Lasioglossum imitatum (Halictidae). Bee abundance and richness fluctuated over time, with peaks in August (abundance) and April (richness). Bee community composition differed among trap sites with differences characterized more by species turnover (replacement) than nestedness or abundance gradients, and indicator taxa largely reflected shared trap site groupings (e.g., two sites) rather than single-site exclusivity. Variation among sites was distributed across multiple pairwise contrasts, with some evidence of dispersion/heterogeneity among sites. Richness estimators suggest substantial unseen diversity (e.g., Chao = 206 ± 66 species), which is consistent with many rare taxa and ongoing species accumulation. An improved understanding of the spatial heterogeneity we detected, e.g., characteristics such as canopy cover, floral resources, deadfall, nesting spaces, etc. can help inform future conservation efforts in spatially constrained suburban spaces.

(Poster) - Building Region-Specific Conservation Habitat Guidance for Georgia’s Working Lands

Presented By: Madison Love*1 , Sarah Rezende2 , Jason Schmidt2 , Conor Fair3 , Bodie Pennisi1

1 Cowart Building, Department of Horticulture, University of Georgia, Griffin, GA;

2 Entomology Annex, Department of Entomology, University of Georgia, Tifton, GA;

3 Flynt Building 325, Department of Applied Statistics, University of Georgia, Griffin, GA

Email: lovemadison123@uga.edu

Abstract: Pollinators and natural enemies play critical roles in agricultural production and ecosystem stability, yet habitat loss and landscape simplification have contributed to declines in many arthropod populations. These declines highlight the need for conservation habitats that support beneficial insects within working landscapes. Native plant species are widely promoted for conservation plantings due to their coevolutionary relationships with native arthropods and potential resilience to regional climatic conditions. However, relatively few species have been systematically evaluated for establishment success, long-term performance, and ecological value within working agricultural landscapes in Georgia. Species may also vary in establishment success, phenology, floral resource production, and arthropod support across Georgia’s ecoregions due to differences in soils, climatic conditions, and landscape context, yet empirical data quantifying these regional differences remain limited. This project aims to develop practical recommendations for establishing native plant conservation habitats in four Georgia ecoregions: the Blue Ridge, Ridge and Valley, Piedmont, and Southeastern Plains. Field experiments were established on private lands using a randomized complete block design evaluating 30 native flowering perennial species and eight warm-season grass species. Data collection includes plant survival, growth, floral provisioning, and arthropod associations. Preliminary first-season results presented here focus on sites in the Blue Ridge and Southeastern Plains. Survival differed among species and between regions, indicating variation in tolerance to transplant stress and early establishment. Species also varied in floral area, suggesting differences in first-year bloom potential and early floral resource availability for beneficial insects. Continued monitoring will further inform region-specific plant species recommendations.

(Poster) - Calcium and boron concentration at different stages of berry development in ‘Farthing,’ ‘Brightwell,’ and ‘Powderblue’ blueberry cultivars

Presented By: L. Carcamo*1 , F. Reyes, M. Faulk1 , and Z. Rubio Ames1

1Department of Horticulture, University of Georgia, Tifton Campus, GA 31794-0748

Email: lilian.carcamo@uga.edu

Abstract: Calcium (Ca) is an essential macronutrient associated with cell wall structure, while boron (B) is related to cell elongation and pollen germination. Thus, adequate levels of Ca and B fertilization ensure good fruit set and berry integrity. Foliar applications of Ca and B at later stages of berry development are commonly performed. However, the effectiveness of foliar application could be affected by stomatal functionality and cuticular wax development as the berry ripens. There is limited information on the concentration of Ca and B at different developmental stages for southern highbush and rabbiteye blueberries. Therefore, the objective of this study was to quantify the concentrations of Ca and B at different stages of development to provide more accurate fertilization guidelines. Three cultivars (‘Farthing,’ ‘Brightwell,’ and ‘Powderblue’) were sampled from tight bud to 75% blue, and leaves were collected monthly from March to June. Samples were sent to an external laboratory for the analysis of Ca and B concentration, as well as Mg and K. The concentration of Ca and B was higher at the tight bud stage and bud swell, but declined from tight cluster to full bloom. An increase in Ca and B was observed at petal fall. However, Ca and B concentrations declined as the berry developed and ripened, while leaf Ca and B concentrations increased. The same pattern was observed for each cultivar regardless of the location. Thus, Ca and B applications should be targeted to the early stages of berry development.

(Poster) - Can Blue Light Replace Fungicides? Evaluating a Novel Turfgrass Disease Control Strategy

Presented By: Susmita Sigdel1 , Colton Mikenzie Jones2 , Robert Clay Bennett2 , Clint Waltz2 , Bochra Amina Bahri1, 3

1 Department of Plant Pathology, University of Georgia, GriEin Campus, GriEin, GA 30223, USA,

2 Department of Crop and Soil Sciences, University of Georgia, GriEin Campus, GriEin, GA 30223 USA,

3 Institute of Plant Breeding, Genetics and Genomics, University of Georgia, GriEin Campus, GriEin, GA 30223, USA

Email: ss70339@uga.edu

Abstract: Dollar spot (Clarireedia monteithiana), rhizoctonia large patch (Rhizoctonia solani), and gray leaf spot (Magnaporthe oryzae) are destructive diseases a9ecting warm-season turfgrasses, reducing turf quality and playability on golf courses and athletic fields. Increasing concerns regarding fungicide resistance highlights the need for alternative disease management strategies. This study evaluated the potential of blue light (405 nm) as a physical treatment to suppress turfgrass pathogens under both laboratory and growth chamber conditions. Short (1-30 min; 3-83 Jcm-2 d-1 ), medium (1-3h; 167-501 Jcm-2 d-1 ) and long (16h; 2,672 Jcm-2 d-1 ) daily blue light exposures were tested in vitro. Long daily exposure of 16h significantly reduced colony growth of C. monteithiana and R. solani, while M. oryzae showed no response. Growth chamber experiments demonstrated that this dose did not a9ect green coverage of bermudagrass, zoysiagrass, seashore paspalum, and St. Augustinegrass, suggesting treatment safety for major turfgrasses. However, in planta trials did not show significant reductions in dollar spot or rhizoctonia large patch severity. Although blue light inhibited certain pathogens under laboratory conditions, disease suppression in plant-pathogen interaction may depend on additional environmental and biological factors. Further field evaluation across multiple seasons and integration with other management strategies are needed before practical recommendations can be made.

(Poster) - Early ecophysiological indicators of native tree establishment under low-maintenance reforestation

Presented By: Tiana Deeb1 , Svoboda Pennisi2

1 Department of Horticulture, University of Georgia, Griffin Campus, Griffin, GA 30223, tiana.deeb@uga.edu

2 Vincent J. Dooley Endowed Professor of Ornamental Horticulture, Department of Horticulture, University of Georgia, Griffin Campus, Griffin, GA 30223, bpennisi@uga.edu

Email: tiana.deeb@uga.edu

Abstract: Reforestation is widely promoted as a strategy for restoring ecosystem function in degraded southern landscapes; however, early establishment often fails due to mismatched species selection, planting stock, or limited maintenance. This study evaluates how planting method and low-maintenance mowing influence early establishment and physiological performance of native trees at Henderson Farm in Henry County, Georgia, where 12,000 trees representing 21 species were planted in December 2024. Within four research blocks (~480 trees), survival, height, browse severity, and foliar ecophysiological traits—including chlorophyll, flavonoids, anthocyanins, and Nitrogen Balance Index—were measured and analyzed using analysis of variance. Preliminary results show 88 percent survival as of July 2025, with deer browsing observed in approximately 10 percent of trees. Container-grown trees generally exhibited higher chlorophyll and Nitrogen Balance Index values across several species, suggesting stronger early nutrient status relative to bare-root stock. Mowed plots tended to show higher chlorophyll, whereas unmowed plots more frequently exhibited elevated flavonoid concentrations and, in some species, higher Nitrogen Balance Index values, indicating species-specific differences in stress signaling and resource allocation under contrasting vegetation management regimes. Anthocyanin levels remained low overall, with limited treatment-driven separation. These early physiological patterns highlight species- and treatment-specific establishment responses and demonstrate the value of ecophysiological monitoring for informing low-maintenance reforestation strategies

(Poster) - Evaluation of Soybean Varieties for Resistance to Root-Knot Nematode (Meloidogyne incognita) in Louisiana

Presented By: Iris Aguilar1 and Tristan Watson1

1Department of Plant Pathology and Crop Physiology, Louisiana State University Agricultural Center, Baton Rouge, LA 70803

Abstract: Soybeans are a major crop in Louisiana, representing 21% of the state’s total crop value. However,the Southern Root-knot nematode (SRKN), Meloidogyne incognita, causes approximately 2.25%yield losses, representing more than 12 million dollars in economic losses. Several management tactics are used to manage plant-parasitic nematodes, including resistant varieties, nematicides,and cover crops, with resistant varieties being the most effective. This project aimed to evaluate the performance of seven soybean varieties labeled as resistant and one susceptible to SRKN. A field trial was conducted to evaluate SRKN densities in soil and roots, as well as the soybean yield. Soil samples were collected at planting, mid-season, and harvest. Nematodes were extracted using an elutriator and sugar flotation technique. Root samples were collected at mid-season and harvest to assess gall ratings using a 0 to 5 scale; nematode egg densities were also quantified. The eight soybean varieties at harvest showed gall indices ranging from 1.5 to 2.3, and nematode egg densities ranged from 9,168 to 78240 eggs per plant, indicating that current host resistance may not be sufficient for SRKN management in soybeans. Six resistant soybean varieties produced higher yields, while one resistant and the susceptible variety had much lower yields. These results highlight the need to identify new SRKN resistance sources and combine more management tactics with existing soybean-resistant varieties.

(Poster) - Genetic Architecture of Specialized Metabolite Resistance in Botrytis cinerea

Presented By: Melanie Madrigal*1 , Jenna Moseley1 , Daniel J. Kliebenstein2 , Jordan A. Dowell1

1Department of Biological Sciences, Louisiana State University, Baton Rouge, Louisiana 70808, USA

2Department of Plant Sciences, University of California, Davis, California 95616, USA

Email: madrigal.melanie007@gmail.com

Abstract: Plants produce a rich diversity of specialized metabolites that shape evolutionary interactions between hosts and their pathogens. These metabolites can act directly and indirectly on pathogens, shaping pathogen survival, growth, and competitive outcomes. However, pathogens such as Botrytis cinerea demonstrate remarkable success despite encountering a diverse chemical landscape. This paradox raises the question of how a generalist pathogen maintains fitness across such a diverse chemical landscape. To explore this, we exposed a population of B. cinerea to the monoterpene linalool and the green leaf volatiles cis-3-hexanol and trans-2-hexanal to quantify variation and identify underlying genetic architecture. Genome-wide association analyses revealed that resistance to linalool is oligogenic, with only a few loci accounting for the phenotypic variation across isolates. In contrast, resistance to cis-3-hexanol and trans-2-hexanal exhibited a polygenic architecture, suggesting that structurally distinct metabolites impose different selection pressures on the same population. These contrasting architectures suggest that B. cinerea employs different resistance strategies depending on the chemical environment it encounters. Our work advances our understanding of how B. cinerea persists across the diverse chemical landscapes created by its many hosts.

Meet our award winners

This year’s awards are for faculty who have shown incredible support to our student members.

Ph.D. Susana Milla-Lewis

Professor and University Faculty Scholar in Turfgrass Breeding and GeneticsCo-Director of the Center for Turfgrass Environmental Research and Education Website: https://nctbg.wordpress.ncsu.edu/ Twitter: @NCTurfBreeding

Dr. Susana Milla-Lewis is a Professor in the Crop and Soil Sciences Department at North Carolina State University. She leads the Turfgrass Breeding and Genetics Program, which she started from scratch in 2009. The goal of the program is to improve the sustainability of the overall turfgrass industry by developing cultivars that require reduced inputs while still maintaining good aesthetic quality. An additional objective of the program is to use genomic information to relate DNA nucleotide polymorphism to traits of agronomic and economic importance. Dr. Milla-Lewis is originally from Lima, Peru were where she obtained a B.S. in Biological Sciences from Universidad Peruana Cayetano Heredia in 1995. In 1996, she immigrated to the U.S. to enroll in graduate school at NC State obtaining M.S. and Ph.D. degrees in Plant Breeding and Genetics in 1998 and 2003, respectively. She has served as chair or co-chair on 23 graduate student committees, published 94 refereed journal articles and 163 abstracts, and secured over $30M in funding as PI and Co-PI. She is a member of several state, national and international professional associations. Dr. Milla-Lewis was named an NC State University Faculty Scholar in 2018.

Ph.D. Alfredo D. Martinez-Espinoza

Dr. Alfredo D. Martinez-Espinoza is a Professor within the Department of Plant Pathology, University of Georgia, Griffin Campus. He is an Extension Specialist working on the development and transfer of information for the identification and management of new or recurring turfgrass diseases small grains, and non-legume forages in Georgia. Alfredo holds a PhD. from the Department of Plant Pathology in Montana State University and a postdoctoral fellowship at the University of Kentucky. Dr. Martinez-Espinoza has published 4 books, 21 book chapters, over 350 scientific articles, extension bulletins, trade journals, popular press and newspapers articles and has participated in over 400 professional and scientific meetings. He has received several honors, including the D.W. Brooks Award for Excellence in Extension, the Walter B. Hill Award for Distinguished Achievement in Public Service and Outreach, the American Phytopathological Society Excellence in Extension Award, and D.W. Brooks Award for Excellence International Agricultural and Environmental Sciences. Originally from a small town in northern Mexico, Dr. Martinez-Espinoza has centered his career on international agricultural cooperation. He has fostered numerous international collaborations, implemented diverse educational programs and technical workshops, provided practical solutions to international partners, and published a wide range of applied and basic research articles, and bilingual publications that reach audiences across the globe. Dr, Martinez is particularly proud of the long, close and esteemed collaboration with Honduras colleagues, and students including the attainment of the 2005 grant “Technology and Capacity Building in Rural Honduras: Educational Partnership Through Distant Diagnosis”; the 2007 seminar training series “Diagnosing Fungal Pathogens from Plant Material and the Use of the DDDI System” at El Zamorano and CURLA in La Ceiba and interacting with faculty of UNA; the training of OIRSA diagnosticians; The inception of UGA-UNA student apprenticeship collaboration consisting of hosting students in UGA scientists’ programs; the hosting of Honduran visiting scientists; the guidance of students in the Master Plant Protection and Pest Management; the wonderful and productive collaboration with Honduran colleagues in the Department of Plant Pathology and Center for Urban Ag; and the nascent collaboration with UGA farm managers. He greatly enjoyed visiting San Pedro Sula, Tela, La Ceiba, Comayagua, Tegucigalpa, Roatan as well as appreciating the Honduran culture, people and food

Dr. Tristan Watson is an Assistant Professor of Nematology in the Department of Plant Pathology and Crop Physiology at the LSU AgCenter in Baton Rouge, Louisiana. He directs the LSU AgCenter Nematology Lab and the Nematode Advisory Service, with statewide responsibility for nematode management on all crops grown in Louisiana. His research program focuses on developing effective integrated nematode management strategies, including evaluation of non-fumigant nematicides, understanding nematode interactions with soil health, and characterizing the distribution of plant-parasitic nematodes. He also teaches PLHL 7000 – Phytonematology, contributing to graduate education in plant pathology and nematology.
Dr. Watson completed his B.Sc. in Microbiology and his Ph.D. in Biology at the University of British Columbia in Canada, where he investigated soil biological factors associated with plant-parasitic nematode regulation and plant growth promotion. He then served as a Postdoctoral Research Associate in the Entomology and Nematology Department at the University of Florida from 2018 to 2020, working on nematode management in vegetable, strawberry, and alternative cropping systems. In 2020, he joined the LSU AgCenter, where his research and extension efforts now support Louisiana growers through improved nematicide chemistries and application methods, evaluation of host resistance, and use of cover crops for nematode management in crops such as sweetpotato, cotton,soybean, and sugarcane.