Widespread occurrence of quinone outside inhibitor fungicide-resistant isolates of cercospora sojina, causal agent of frogeye leaf spot of soybean, in the United States

Guirong Zhang, Tom W. Allen, Jason P. Bond, Ahmad M. Fakhoury, Anne E. Dorrance, Linda Weber, Travis R. Faske, Loren J. Giesler, Donald E. Hershman, Brenda S. Kennedy, Danilo L. Neves, Clayton A. Hollier, Heather M. Kelly, Melvin A. Newman, Nathan M. Kleczewski, Steve R. Koenning, Lindsey D. Thiessen, Hillary L. Mehl, Tian Zhou, Michael D. MeyerDaren S. Mueller, Yuba R. Kandel, Paul P. Price, John C. Rupe, Edward J. Sikora, Jeffrey R. Standish, Maria Tomaso-Peterson, Kiersten A. Wise, Carl A. Bradley

Research output: Contribution to journalArticlepeer-review

25 Scopus citations


Isolates of Cercospora sojina, causal agent of frogeye leaf spot of soybean (Glycine max), were collected across Alabama, Arkansas, Delaware, Illinois, Indiana, Iowa, Kentucky, Louisiana, Mississippi, Missouri, North Carolina, Ohio, Tennessee, and Virginia and were evaluated for quinone outside inhibitor (QoI) fungicide resistance. Collection of these isolates from these 14 states occurred between 2010 and 2017. QoI fungicide-resistant C. sojina isolates were detected in all 14 states surveyed and represent a total of 240 counties or parishes. In 2017, these 240 counties and parishes represented approximately 13% of the harvested soybean hectares in the United States. In light of this widespread occurrence of QoI fungicide-resistant C. sojina isolates, management of frogeye leaf spot should focus on integrated management practices such as planting resistant soybean cultivars, rotating with nonhost crops, and tilling to speed up decomposition of infested soybean residue. When foliar fungicide application is warranted, fungicide products that contain active ingredients from chemistry classes other than the QoI class should be applied for frogeye leaf spot management.

Original languageEnglish
Pages (from-to)295-302
Number of pages8
JournalPlant Health Progress
Issue number4
StatePublished - 2018

Bibliographical note

Funding Information:
Funding: This research was supported, in part, by the Soybean Checkoff Program with grants from the United Soybean Board, Arkansas Soybean Promotion Board, Delaware Soybean Board, Illinois Soybean Association, Iowa Soybean Association, Kentucky Soybean Promotion Board, Louisiana Soybean and Feed Grains Research and Promotion Board, Mississippi Soybean Promotion Board, North Carolina Soybean Producers Board, and Virginia Soybean Board. Support also was provided by State and Federal Funds appropriated to the State Land Grant Institutions of cooperating authors and the National Institute of Food and Agriculture, U.S. Department of Agriculture.

Publisher Copyright:
© 2018 The American Phytopathological Society.

ASJC Scopus subject areas

  • Plant Science
  • Horticulture


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