A5004556854- Plant Pathogens and Fungal Diseases
- Yeasts and Rust Fungi Studies
- Sunflower and Safflower Cultivation
- Plant Pathogens and Resistance
- Powdery Mildew Fungal Diseases
- Soybean genetics and cultivation
- Plant Disease Resistance and Genetics
- Plant Disease Management Techniques
- Plant pathogens and resistance mechanisms
- Plant-Microbe Interactions and Immunity
- Nematode management and characterization studies
- Fungal Plant Pathogen Control
- Nitrogen and Sulfur Effects on Brassica
- Legume Nitrogen Fixing Symbiosis
- Mycotoxins in Agriculture and Food
- Genetic and Environmental Crop Studies
- Botany, Ecology, and Taxonomy Studies
- Wheat and Barley Genetics and Pathology
- Plant Pathogenic Bacteria Studies
- Fungal and yeast genetics research
- Agricultural pest management studies
- Plant Virus Research Studies
- Smart Agriculture and AI
- Microbial infections and disease research
- Cassava research and cyanide
North Dakota State University
2016-2025
South Dakota State University
2015-2018
Agricultural Research Service
2015-2018
Iowa State University
2018
Edward T. Schafer Agricultural Research Center
2015-2018
Agricultural Research Council of South Africa
2017
Michigan State University
2016
University of Wisconsin–Madison
2016
United States Department of Agriculture
2015
Western Nebraska Community College
2015
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...
Oomycete pathogens are commonly associated with soybean root rot and have been estimated to reduce yields in the United States by 1.5 million tons on an annual basis. Limited information exists regarding frequency diversity of oomycete species across major soybean-producing regions North America. A survey was conducted 11 states province Ontario, Canada. In 2011, 2,378 cultures were isolated from seedling roots a semiselective medium (CMA-PARPB) identified sequencing internal transcribed...
Soybean (Glycine max (L.) Merr.) is produced across a vast swath of North America, with the greatest concentration in Midwest. Root rot diseases and damping-off are major concern for production, primary causal agents include oomycetes fungi. In this study, we focused on examination oomycete species distribution soybean production system how environmental soil (edaphic) factors correlate community composition at early plant growth stages. Using culture-based approach, 3,418 isolates were...
Abstract Plant diseases introduce significant yield and quality losses to the food production industry, worldwide. Early identification of an epidemic could lead more effective management disease potentially reduce loss limit excessive input costs. Image processing deep learning techniques have shown promising results in distinguishing healthy infected plants at early stages. In this paper, potential four convolutional neural network models, including Xception, Residual Networks (ResNet)50,...
The geographic range of stripe rust wheat, caused by Puccinia striiformis f. sp. tritici, has increased dramatically since 2000 in the United States. Yield losses to disease have been most severe eastern States, where measurable yield loss had rare prior 2000. objective this study was examine phenotypic and genotypic variation among isolates P. tritici collected from populations States before Virulence phenotype amplified fragment length polymorphism (AFLP) markers were used 42 between 1960...
Phomopsis stem canker causes yield reductions on sunflower (Helianthus annuus L.) several continents, including Australia, Europe, and North America. In the United States, incidence has increased 16-fold in Northern Great Plains between 2001 2012. Although Diaporthe helianthi was assumed to be sole causal agent a newly described species, D. gulyae, found primary cause of Australia. To determine identity spp. causing Plains, 275 infected stems were collected 2010 Phylogenetic analyses...
Between 2002 and 2015, a comprehensive survey of sunflower fields across seven Midwestern U.S. states was conducted 12 times continues to be every other year. The surveyors collected data on yield, agronomic management factors, disease, insect, weed, bird damage. All were volunteers came from universities (extension research staff), USDA-ARS, seed chemical companies. In the years conducted, 2,267 collected. results are presented annually at National Sunflower Association Research Forum used...
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,...
Core Ideas Nitrogen availability and fertilization can increase sunflower see yield. may decrease oil concentration of oilseed sunflower. increases lodging risk in windy regions. The N P recommendations for sunflowers growers North Dakota have not been changed 30 yr. Twenty‐two rate experiments were conducted during 2014 2015. objective was to determine the response seed yield, concentration, available P. In studies a randomized complete block split plot with as main plots subplots. applied...
Sunflower is the fourth most produced vegetable oil worldwide and ranked fifth of 13 cultivated crops major importance to global food security (FAO 2022; Hajjar Hodgkin 2007; Seiler et al. 2018). affected by many economically-important yield-limiting diseases, this article first an anticipated series Plant Health Progress - Diagnostic Guides on significant heads diseases sunflower. This follows a similar sunflower stem (Harveson 2018, Ryley 2021). Here we present information Botrytis head...
Sunflower is one of the most important oil crops globally, and impacted by numerous yield-limiting diseases. This publication second in an anticipated series Plant Health Progress Diagnostic Guides focused on head diseases, follows a similar stem diseases (Harveson et al. 2018; Ryley 2021). provides information signs symptoms for identifying distinguishing Rhizopus rot from other methods techniques working with causal organism, references to further resources.
The objectives of this study were to examine the relative abundance Gibberella zeae ascospores and conidia other Fusarium species on wheat spikes in a field environment, relate inoculum counts G. airborne spore counts, evaluate an bioassay technique. levels spores measured North Dakota during 1999, 2000, 2001 growing seasons. Spores collected from 24-h potted-plant fallowed spring plot bioassay. Inoculum assessed by placing solution recovered bioassays selective medium; meanwhile, enumerated...
Sunflower rust caused by Puccinia helianthi (Schw.) is widespread in North America and occurs annually on cultivated sunflower (Helianthus annuus L.) wild annual perennial Helianthus spp., although severity the U.S. crop has been increasing recent years (2). P. a autoecious, macrocyclic rust, but aecial stage rarely observed field (1,3,4). In most years, earliest appearance of Dakota (ND) surrounding states usually early August as uredinial stage. Initial inoculum can result from...
Acreage of dry field pea (Pisum sativum) in North Dakota has increased approximately eightfold from the late 1990s to 2000s over 200,000 ha annually. A coincidental increase losses root rots also been observed. Root rot is commonly caused by a complex pathogens which included Fusarium spp. and Rhizoctonia solani. R. solani isolates were obtained roots sampled at three- five-node growth stage fields symptomatic samples received Plant Diagnostic Lab State University 2008 2009. Using Bayesian...
Downy mildew, caused by Plasmopara halstedii (Farl.) Berl. and de Toni, is an economically important disease in cultivated sunflowers, Helianthus annuus L. Resistance genes incorporated into commercial hybrids are used as effective management tool, but the duration of effectiveness limited virulence evolves pathogen population. A comprehensive assessment was conducted 2014 2015 U.S. Great Plains states North Dakota South Dakota, where approximately 75% sunflower produced annually. The...