Soybean (North Central)
Coordinated by Daren Mueller (, Assistant Professor,
Extension Plant  Pathologist and Adam Sisson (,
Extension Program Specialist, Iowa State University, Integrated Pest Management


Soybeans are grown worldwide for use in livestock feed, oil, human food, and biofuel. In the United States, 108 million metric tons of soybean were produced in 2014. Soybeans make up 90% of the oilseed produced in the United States and are the largest source of livestock feed protein globally. Soybean grown in the Midwest can be infected by pathogens that cause root rots, foliar diseases and stem diseases. Each soybean disease depends on specific environmental conditions to get established and develop so they may not be a problem each year.

Soybean (Glycine max) (L.) Merr.,
Scott Bauer, USDA Agricultural Research Service,


Tracking these diseases over time will ultimately help farmers and agronomists make informed management decisions, especially given the climatic challenges farmers have endured over the past decade. Currently, there is a lack of information about where many soybean diseases occur nationwide, and certainly no information about where they occur within each year. iPIPE will allow scientists, agronomists, crop scouts, and farmers to be better/informed about possible local diseases.

ISU_IPM icon


Changing weather patterns not only affect soybean growth and development, but will also affect plant pathogens. In recent years, there have been outbreaks of several soybean diseases directly related to extreme weather events (white mold, sudden death syndrome, charcoal rot, and Cercospora leaf blight). It is predicted that leaf and root pathogens will be more problematic because of an overall increase in humidity and frequency of heavy rainfall events that is projected for many parts of the U. S.  There have been documented changes in spring arrival of many insect species due to climate change, as temperature is the single most important factor affecting insects. Some of these insects may be vectors for certain soybean viruses such as soybean vein necrosis virus. 

Important Pests

  • Root rots caused by diseases including Pythium root rot, Phytophthora root rot, Rhizoctonia root rot and Fusarium root rot.
  • Foliar diseases including frogeye leaf spot, Cercospora leaf blight, soybean vein necrosis virus and downy mildew.
  • Stem diseases including sudden death syndrome, stem canker, white mold and charcoal rot.
  • Nematodes –soybean cyst nematode
frogeye leaf spot (Cercospora sojina)
Frogeye leaf spot (Cercospora sojina)
Daren Mueller, Iowa State University,