Validating Sclerotinia sclerotiorum apothecial models to predict Sclerotinia stem rot in Soybean (Glycine max) fields

Jaime F. Willbur, Mamadou L. Fall, Adam M. Byrne, Scott A. Chapman, Megan M. McCaghey, Brian D. Mueller, Roger Schmidt, Martin I. Chilvers, Daren S. Mueller, Mehdi Kabbage, Loren J. Giesler, Shawn P. Conley, Damon L. Smith

Research output: Contribution to journalArticlepeer-review

Abstract

In soybean, Sclerotinia sclerotiorum apothecia are the sources of primary inoculum (ascospores) critical for Sclerotinia stem rot (SSR) development. We recently developed logistic regression models to predict the presence of apothecia in irrigated and nonirrigated soybean fields. In 2017, small-plot trials were established to validate two weather-based models (one for irrigated fields and one for nonirrigated fields) to predict SSR development. Additionally, apothecial scouting and disease monitoring were conducted in 60 commercial fields in three states between 2016 and 2017 to evaluate model accuracy across the growing region. Site-specific air temperature, relative humidity, and wind speed data were obtained through the Integrated Pest Information Platform for Extension and Education (iPiPE) and Dark Sky weather networks. Across all locations, iPiPE-driven model predictions during the soybean flowering period (R1 to R4 growth stages) explained end-of-season disease observations with an accuracy of 81.8% using a probability action threshold of 35%. Dark Sky data, incorporating bias corrections for weather variables, explained end-of-season disease observations with 87.9% accuracy (in 2017 commercial locations in Wisconsin) using a 40% probability threshold. Overall, these validations indicate that these two weather-based apothecial models, using either weather data source, provide disease risk predictions that both reduce unnecessary chemical application and accurately advise applications at critical times.

Original languageEnglish (US)
Pages (from-to)2592-2601
Number of pages10
JournalPlant disease
Volume102
Issue number12
DOIs
StatePublished - Dec 2018
Externally publishedYes

Bibliographical note

Funding Information:
The integrated pest information platform for extension and education CAP is supported by the United States Department of Agriculture (USDA) National Institute of Food and Agriculture (NIFA) Agriculture and Food Research Initiative (AFRI) Competitive Grants Program Food Security Challenge Area Grant 2015-68004-23179. Additional generous support was provided by the USDA Hatch program, the University of Wisconsin-Madison Science and Medicine Graduate Research Scholars fellowship program, the Wisconsin Soybean Marketing Board, the Michigan Soybean Promotion Council, the North Central Soybean Research Program, and the United Soybean Board.

Funding Information:
Funding: The integrated pest information platform for extension and education CAP is supported by the United States Department of Agriculture (USDA) National Institute of Food and Agriculture (NIFA) Agriculture and Food Research Initiative (AFRI) Competitive Grants Program Food Security Challenge Area Grant 2015-68004-23179. Additional generous support was provided by the USDA Hatch program, the University of Wisconsin-Madison Science and Medicine Graduate Research Scholars fellowship program, the Wisconsin Soybean Marketing Board, the Michigan Soybean Promotion Council, the North Central Soybean Research Program, and the United Soybean Board.

Publisher Copyright:
© 2018 The American Phytopathological Society

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