A5025958552- Plant Pathogens and Fungal Diseases
- Plant Pathogens and Resistance
- Plant pathogens and resistance mechanisms
- Plant Disease Management Techniques
- Yeasts and Rust Fungi Studies
- Soybean genetics and cultivation
- Nematode management and characterization studies
- Plant Disease Resistance and Genetics
- Agronomic Practices and Intercropping Systems
- Mycorrhizal Fungi and Plant Interactions
- Legume Nitrogen Fixing Symbiosis
- Crop Yield and Soil Fertility
- Forest Ecology and Biodiversity Studies
- Soil Management and Crop Yield
- Agricultural Engineering and Mechanization
- Ecology and Vegetation Dynamics Studies
- Plant-Microbe Interactions and Immunity
- Agroforestry and silvopastoral systems
- Wheat and Barley Genetics and Pathology
- Cassava research and cyanide
- Soil Mechanics and Vehicle Dynamics
- Genetic Mapping and Diversity in Plants and Animals
- Agriculture and Farm Safety
- Plant Micronutrient Interactions and Effects
- Genetics and Plant Breeding
University of Minnesota
2004-2022
The Ohio State University
2016
Iowa State University
2016
University of Illinois Urbana-Champaign
2016
University of Nebraska–Lincoln
2016
Purdue University West Lafayette
2016
Monsanto (United States)
2016
University of Kentucky
2016
University of Wisconsin–Madison
1999-2013
Planta
2004
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 There are numerous reports of the beneficial effects rotating corn ( Zea mays L.) and soybean [ Glycine max (L.) Merr.]. However, few studies have been specifically designed to document important corn‐soybean rotation effect. The objective this study was determine impact various cropping patterns on yield both crops. 9‐year field conducted at two locations managed for maximum production. Cropping sequences consisted of: continuous monoculture with same cultivar; cultivars...
Pythium spp. cause seed decay, damping-off, and root rot in soybean corn; however, their diversity importance as pathogens Minnesota are unknown. Our objectives were to identify the present fields, determine aggressiveness on corn soybean, investigate sensitivity treatment fungicides. For identification, sequences obtained using internal transcribed space ITS4 ITS1 primers compared with reference National Center for Biotechnology Information database. Seedling soil samples yielded over 30...
Pathotype diversity of Phytophthora sojae was assessed in 11 states the United States during 2012 and 2013. Isolates P. were recovered from 202 fields, either soil samples using a soybean seedling bioassay or by isolation symptomatic plants. Each isolate inoculated directly onto 12 differentials; no Rps gene 1a, 1b, 1c, 1k, 3a, 3b, 3c, 4, 6, 7, 8. There 213 unique virulence pathotypes identified among 873 isolates collected. None genes effective against all collected but Rps6 Rps8 majority...
Sudden death syndrome (SDS), caused by Fusarium virguliforme, has spread to northern soybean growing regions in the US causing significant yield losses. The objectives of this study were identify loci underlying variation plant responses SDS through association mapping (AM) and assess prediction accuracy genomic selection (GS) a panel early maturing germplasm. A set 282 breeding lines was selected from University Minnesota program then genotyped using genome-wide 1536 single-nucleotide...
Sclerotinia stem rot of soybean, caused by sclerotiorum, is a major disease in the north central region United States. One approach to managing on soybean use fungicides. S. sclerotiorum was assayed for sensitivity benomyl, tebuconazole, thiophanate methyl, and vinclozolin pure cultures agar medium, inoculated seedlings, detached leaves, experimental field plots. To evaluate inhibitory effect four fungicides growth vitro, potato dextrose (PDA) amended with at six concentrations. Based...
Sclerotinia stem rot (SSR), caused by sclerotiorum (Lib.) de Bary, is an important soybean [ Glycine max (L.) Merr.] disease in the North Central States. The effect of tillage, crop sequence, and cultivar on SSR incidence yield was evaluated a 3‐yr on‐farm study conducted at Janesville, Sharon, Waunakee, WI. In study, arranged split‐split‐split‐split plot design, main plots were tillage: moldboard (MB), chisel plow (CP), or no‐till (NT); subplots 1995 crops: corn ( Zea mays L.), small grain,...
Sudden death syndrome, caused by Fusarium virguliforme, is an important disease of soybean in the United States. Fifteen species crops, weeds, or prairie plants were evaluated for their potential as hosts F. virguliforme. Root and foliar symptoms plant biomass assessed following greenhouse inoculation studies. colonization virguliforme was determined with isolations polymerase chain reaction assays. Soybean, alfalfa, pinto navy bean, white red clover, pea, Canadian milk vetch developed root...
ABSTRACT Inoculants containing Bradyrhizobium japonicum are available for soybean [ Glycine max (L.) Merr.] production but may not be necessary in fields where previously has been produced. The objective of this study was to determine yield response and probability an economic return from inoculants with a recent history production. Fifty‐one inoculant products were evaluated experiments ( n = 73) conducted Indiana, Iowa, Minnesota, Nebraska, Wisconsin between 2000 2008. Inoculant similar...
Field studies with the spring wheat ( Triticum aestivum L.) cultivars ‘Era’ and ‘OlaF’ were conducted to assess effects of reductions in kernel number per spike defoliation individual culms on growth characteristics. The importance stage at which treatments applied was also examined by treating both anthesis + 14 days, later date being after beginning kernels linear dry matter accumulation period. final weight depended time treatment relative weights from untreated (control) culms. Reduction...
Abstract Arbuscular mycorrhizal fungi (AMF), ubiquitous symbiotic colonizing plant roots, can contribute to growth by improving nutrient uptake and stress tolerance. The influence of management practices crop species on AMF spore populations percent root colonization was examined during conversion from conventional low‐input systems in 2‐yr rotations planted alternating corn ( Zea mays L.)‐soybean [ Glycine max (L.) Merr.] sequences established two adjacent areas with different histories....
Abstract Crop and edaphic factors influence arbuscular mycorrhizal (AM) fungal species composition populations. This study was conducted to determine the effect of management history, crop, input system on AM spore Corn ( Zea mays L.)‐soybean [ Glycine max (L.) Merr.] sequences receiving no inputs (NI), organic (OI), minimum (MI), conventional (CI) were established in two adjacent areas with differing histories: one area, Koch Farm, had received fertilizer or herbicide for past 25 yr; other...
Abstract Crop rotation provides a yield benefit that persists at optimal management levels. The exact reason for the effect is unknown. One theory given crop's own residue has an autoinhibitory when crop maintained under monoculture, and/or residues of alternate crops have stimulatory on one another rotation. We conducted field studies Lamberton, Rosemount, and Waseca, MN to test this theory. Soils these locations are: Webster clay loam (fine‐loamy, mixed mesic Typic Haplaquolls), Waukegan...
In 2005, weekly rain samples collected at 124 National Atmospheric Deposition Program/National Trends Network (NADP/NTN) sites in the eastern and central United States were screened for Asian soybean rust (ASR; Phakopsora pachyrhizi) urediniospores. Application of a quantitative polymerase chain reaction method detected P. pachyrhizi DNA filter residue during week 19 to 26 July 2005 Minnesota, Missouri, South Dakota. To determine geographic origin ASR urediniospores those composite samples,...
Corn ( Zea mays L.) usually yields more when rotated with soybean [ Glycine max (L.) Merr.] than grown continuously. The exact reason for this yield increase in unknown. One objective of study was to determine whether the corn is due a positive influence or absence negative continuous corn. An alternate year fallow compared an which effective alleviating reduction associated A second if application triacontanol (no chemical name available) (TRIA, reported be present residue, and enhance...
The position of the kernel milk line can be used to visually monitor grain maturation in corn (Zea mays L.). objective this study was determine if could when harvest for silage. Four hybrids (two full season, and two short season) were grown field during each three years. As plants approached maturity, ears removed noted. Ears stover then chopped together moisture content fodder determined. Measurements taken at: full-dent (every on ear dented), ½-milk (milk positioned half way between tip...
The fungal deuteromycetes Phialophora gregata and Plectosporium tabacinum are associated with soybean plants. P. causes brown stem rot (BSR) of soybean, whereas is a frequent cohabitant stems. role in growth the development BSR not known. Traditional methods isolating differentiating these two fungi require up to 3 weeks complete. In order effectively study interactions among gregata, , plant, we developed specific primers for based on its rDNA internal transcribed spacer sequences....
In August 1999, soybean (Glycine max (L.) Merr.) plants exhibiting symptoms of charcoal rot were observed near Zumbrota, MN. Symptoms included shrunken, unfilled pods, and brown, wilted leaves attached to dead petioles stems (1). When symptomatic split, areas gray-to-black discoloration where present in the stem cortex Black, spherical microsclerotia 77 90 µm diameter elongated 120 long (1) found vascular tissue. Stem tissue placed on potato dextrose agar (PDA) yielded fungal colonies...
Brown stem rot (BSR), caused by Phialophora gregata f. sp. sojae, is an important yield-limiting disease of soybean (Glycine max) in the midwestern United States. Midwestern populations P. are separated into genotypes A and B based on intergenic spacer sequences nuclear ribosomal DNA. Genotype causes both leaf symptoms, genotype typically internal symptoms only. Data limited geographic distribution B. It not well understood whether cultivars may be infected preferentially a genotype. Field...