2005 trials: Efficacy of soybean rust fungicides on other fungal diseases in Iowa

Alison Robertson, Iowa State University
John Shriver, Iowa State University
Shrishail Sharanappa Navi, Iowa State University
Xiao-Bing Yang, Iowa State University

This article is from Integrated Crop Management News, IC496(3) (February 27, 2006): 46–47.


During the 2005 growing season, fungicide efficacy trials were done at the Iowa State University Southeast Research and Demonstration Farm near Crawfordsville and the Northeast Research and Demonstration Farm at Nashua. The introduction of Asian soybean rust into the United States necessitated these experiments since fungicide applications are the only management tool available for this disease. No Asian soybean rust was found in Iowa during 2005; however, the trials were used to determine the efficacy of fungicides, labeled for Asian soybean rust, against other fungal diseases that occur in Iowa. Treatment details are given in Table 1. Data on the severity (%) of fungal diseases, phytotoxicity, and plot yields (bu/acre) were collected. All treatments were compared with an unsprayed control.