A5078346600- Peanut Plant Research Studies
- Agricultural pest management studies
- Plant Virus Research Studies
- Plant Pathogens and Fungal Diseases
- Mycotoxins in Agriculture and Food
- Plant Disease Resistance and Genetics
- Plant Disease Management Techniques
- Nematode management and characterization studies
- Coconut Research and Applications
- Plant Pathogens and Resistance
- Plant and Fungal Interactions Research
- Fungal and yeast genetics research
- Wheat and Barley Genetics and Pathology
- Soybean genetics and cultivation
- Yeasts and Rust Fungi Studies
- Insect-Plant Interactions and Control
- Plant pathogens and resistance mechanisms
- Plant-Microbe Interactions and Immunity
- Nitrogen and Sulfur Effects on Brassica
- Agronomic Practices and Intercropping Systems
- Legume Nitrogen Fixing Symbiosis
- Plant Pathogenic Bacteria Studies
- Fungal Biology and Applications
- Plant Stress Responses and Tolerance
- Biopolymer Synthesis and Applications
University of Georgia
2016-2025
Virginia Cooperative Extension
2021
Peanut Institute
2020
Plant (United States)
2008-2019
Griffin Hospital
2013
Marymount University
2006-2010
Georgia College & State University
2010
Ensco (United States)
1994-1995
Annual decreases in soybean (Glycine max L. Merrill) yield caused by diseases were estimated surveying university-affiliated plant pathologists 28 soybean-producing states the United States and Ontario, Canada, from 2010 through 2014. Estimated losses each disease varied greatly state or province year. Over duration of this survey, cyst nematode (SCN) (Heterodera glycines Ichinohe) was to have more than twice as much loss any other disease. Seedling (caused various pathogens), charcoal rot...
Soybean (Glycine max [L.] Merrill) yield losses as a result of plant diseases were estimated by university and government pathologists in 29 soybean producing states the United States Ontario, Canada, from 2015 through 2019. In general, that resulted each 28 or pathogens varied state province well year. cyst nematode (SCN) (Heterodera glycines Ichinohe) caused more than twice much loss any other disease during survey period. Seedling (caused various pathogens), Sclerotinia stem rot (white...
Abstract Contamination of crops with aflatoxin is a serious global threat to food safety. Aflatoxin production by Aspergillus flavus exacerbated drought stress in the field and oxidative vitro. We examined transcriptomes three toxigenic atoxigenic isolates A. conducive non-conducive media varying levels H 2 O investigate relationship secondary metabolite production, carbon source, stress. found that employ distinct mechanisms remediate damage, source affected isolates’ expression profiles....
Drought stress conditions decrease maize growth and yield, aggravate preharvest aflatoxin contamination. While several studies have been performed on mature kernels responding to drought stress, the metabolic profiles of developing are not as well characterized, particularly in germplasm with contrasting resistance both mycotoxin Here, following screening for tolerance, a drought-sensitive line, B73, drought-tolerant Lo964, were selected stressed beginning at 14 days after pollination....
Soybean rust, caused by Phakopsora pachyrhizi, is a devastating foliar disease of soybean that may cause significant yield losses if not managed well-timed fungicide applications. To determine the effect timing on rust severity and yield, field trials were completed in Paraguay (four locations), United States (two Zimbabwe (one location) from 2005 to 2006. Treatments at each location included applications tebuconazole, pyraclostrobin, or combination azoxystrobin + propiconazole, some...
The infection of maize and peanut with Aspergillus flavus subsequent contamination aflatoxin pose a threat to global food safety human health, is exacerbated by drought stress. Drought stress-responding compounds such as reactive oxygen species (ROS) are associated fungal stress responsive signaling secondary metabolite production, can stimulate the production A. in vitro. These metabolites have been shown possess diverse functions soil-borne fungi including antibiosis, competitive...
The colonization of maize (Zea mays L.) and peanut (Arachis hypogaea by the fungal pathogen Aspergillus flavus results in contamination kernels with carcinogenic mycotoxins known as aflatoxins leading to economic losses potential health threats humans. regulation aflatoxin biosynthesis various spp. has been extensively studied, shown be related oxidative stress responses. Given that environmental stresses such drought heat result accumulation reactive oxygen species (ROS) within host plant...
Drought stress decreases crop growth, yield, and can further exacerbate pre-harvest aflatoxin contamination. Tolerance adaptation to drought is an important trait of agricultural crops like maize. However, maize genotypes with contrasting tolerances have been shown possess both common genotype-specific adaptations cope stress. In this research, the physiological metabolic response patterns in leaves seedlings subjected were investigated using six including: A638, B73, Grace-E5, Lo964,...
In October 2009, large aggregations of Megacopta cribraria (F.) (Heteroptera: Plataspidae) were discovered on outside, perimeter walls houses in northeast Georgia, prompting homeowners to contact county Extension agents and pest management professionals learn more about the insect rid premises nuisance. The was flying from nearby patches kudzu (Pueraria spp.) onto houses, presumably an attempt locate overwintering sites. its native Asia, one preferred hosts is kudzu, invasive, leguminous...
Fusarium wilt is an important and widespread disease of cotton (Gossypium hirsutum L. Gossypium barbadense L.) caused by several races genotypes oxysporum f. sp. vasinfectum W.C. Snyder & H.N. Hans (FOV). A two-year survey (2012-2013) was conducted to assess the distribution fungus, in particular FOV race 4, throughout United States (U.S.) Cotton Belt. Partial sequences translation elongation factor (EF-1α) region cultured from symptomatic plants were compared a database known genotypes....
Existing crop monitoring programs determine the incidence and distribution of plant diseases pathogens assess damage caused within a production region. These have traditionally used observed or predicted disease pathogen data environmental information to prescribe management practices that minimize loss. Monitoring are especially important for crops with broad geographic can cause rapid great economic losses. Successful been developed several diseases, including downy mildew cucurbits,...
Corynespora cassiicola is a ubiquitous fungus causing emerging plant diseases worldwide, including target spot of cotton, soybean, and tomato, which have rapidly increased in incidence severity throughout the southeastern United States. The objectives this study were to understand causes for epidemics States by comparing phylogenetic relationships isolates from other crop plants ornamental hosts, through determination host range populations. Fifty-three sampled 1,380 nucleotides four nuclear...
Abstract Background Aspergillus flavus is an important agricultural and food safety threat due to its production of carcinogenic aflatoxins. It has high level genetic diversity that adapted various environments. Recently, we reported two reference genomes A. isolates, AF13 ( MAT1-2 highly aflatoxigenic isolate) NRRL3357 MAT1-1 moderate aflatoxin producer). Where, insertion 310 kb in included producing gene bZIP transcription factor, named atfC . Observations significant genomic variants...
Aspergillus flavus is an opportunistic pathogen of plants such as maize and peanut under conducive conditions drought stress resulting in significant aflatoxin production. Drought-associated oxidative also exacerbates production by A. flavus. The objectives this study were to use proteomics provide insights into the responses H2O2-derived stress, identify potential biomarkers targets for host resistance breeding. Three isolates, AF13, NRRL3357, K54A with high, moderate, no production,...
Drought stress in the field has been shown to exacerbate aflatoxin contamination of maize and peanut. heat also produce reactive oxygen species (ROS) plant tissues. Given potential correlation between ROS exacerbated production under drought stress, objectives this study were examine effects hydrogen peroxide (H2O2)-induced oxidative on growth different toxigenic (+) atoxigenic (−) isolates Aspergillus flavus test whether affects H2O2 concentrations that could survive. Ten tested: NRRL3357...
Biocontrol using non-aflatoxigenic strains of Aspergillus flavus has the greatest potential to mitigate aflatoxin contamination. However, factors that influence efficacy biocontrol agents under field conditions are not well understood. Shifts in genetic structure indigenous soil populations A. following application products Afla-Guard and AF36 were investigated determine how these changes strains. Soil samples collected from maize fields Alabama, Georgia North Carolina 2012 2013 population L...
In October 2023, during scouting operations, two symptomatic corn plants (cv. Dekalb 68-95) with large circular, light brown/tan lesions concentric rings covering the stalks and leaves were observed on a commercial field in Grady County, Georgia (USA). Foliar resembled Hyalothyridium leaf spot of maize, prevalent disease Latin America countries, but that has not been United States. The identification causal agent was confirmed by morphological molecular features isolated fungus. Sequencing...
Abstract Effective disease and pest management in peanut ( Arachis hypogea L.) requires adequate spray penetration within the canopy during pesticide applications. Field studies were conducted to assess deposition at three carrier volumes of 10, 15 20 gallons per acre (GPA), with each volume applied using different nozzle types (extended range [XRC], air induction extended [AIXR], Turbo TeeJet Induction [TTI]). Spray was assessed water various application timings (45, 60, 90, 120 DAP) by...
ABSTRACT The fungal species Ramulariopsis pseudoglycines was recently reported as a pathogen of cotton in the United States. Here, we report first genome this assembled using nanopore sequencing. size is ~77.9 Mb, with an N 50 ~2.5 GC content 52.74%, and Benchmarking Universal Single-Copy Orthologs (BUSCO) completeness 99.5%.
Areolate mildew, caused by two Ramulariopsis species (R. gossypii and pseudoglycines), is an important re-emergent cotton disease in the Southeastern United States. This has been considered of secondary importance, but recent prevalence high incidence observed regions have raised concern about its importance. Timely applications quinone outside inhibitor (QoI) fungicides suggested to manage this disease, QoI resistance development frequently detected for many fungal pathogens. In 2023, spp....
The protectant fungicide chlorothalonil has been used for management of late leaf spot (Nothopassalora personata) peanut (Arachis hypogaea) over fifty years. However, recent concerns with regulatory issues in both the U.S. and European Union have prompted efforts to identify alternatives control. Cuprous oxide shown promise control, but a direct comparison between cuprous not previously reported. Seven field experiments were conducted Tifton, GA from 2010 2024 which effects on compared when...