Effect of seed treatment on early season brown spot caused by Septoria glycines of soybean

Jean C. Batzer, Yuba R. Kandel, Carl A. Bradley, Martin I. Chilvers, Albert U. Tenuta, Kiersten A. Wise, Edward Hernández, Daren S. Mueller

Research output: Contribution to journalArticlepeer-review

4 Scopus citations


Early season brown spot caused by Septoria glycines was compared in Illinois, Indiana, Iowa, Michigan, and Ontario, Canada, soybean fields planted with differing commercial seed treatments. Seed treatments that included fluopyram significantly reduced brown spot (P < 0.001). A greenhouse mist chamber experiment revealed that fluopyram seed treatment reduced the Area Under Disease Progress Curve of brown spot over a 6-week period (P < 0.001). Brown spot severity was unaffected by plant age at inoculation for the control treatment without fluopyram (P = 0.911); however, severity increased with plant age at inoculation for the fluopyram treatment (P = 0.009). The sensitivity of two S. glycines isolates to fluopyram was assessed by determining the effective concentration required to reduce its colony diameter growth in culture by 50% (EC50). Both isolates had an EC50 of 0.41 μg/ml of fluopyram. These results demonstrate that fluopyram seed treatment is effecttive at controlling early season brown spot in soybean.

Original languageEnglish
Pages (from-to)223-228
Number of pages6
JournalPlant Health Progress
Issue number4
StatePublished - 2016

Bibliographical note

Funding Information:
The study was partially funded by Bayer CropScience and soybean checkoff programs through the North Central Soybean Research Program in the United States. The Grain Farmers of Ontario, Canada also provided funding obtained through the Ontario Farm Innovation Program (OFIP), which is a component of Growing Forward 2. We would also like to thank D. Sjarpe, G. Watson, and S. Wiggs from Iowa State University; J. Ravellette, N. Anderson, A. Ramirez, J. Solis, K. Raun, J. Leuck from Purdue University; K. Ames and J. Weems from University of Illinois; A. M. Byrne, J. F. Boyse, and R. G. Laurenz from Michigan State University; C. Van Herk and G. Kotulak from Ontario Ministry of Agriculture Food and Rural Affairs for trial establishment, maintenance and data collection; and Michael McCarville from Bayer Crop Science for providing treated seed and suggestions on early drafts of the manuscript.

Publisher Copyright:
© 2018.

ASJC Scopus subject areas

  • Plant Science
  • Horticulture


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