Posted on Sep 20, 2016 by Suzanne Bissonnette

Soybean Rust found in Southern Illinois 2016

Soybean rust (Phakopsora pachyrhizi) has been found in southern Illinois.  Samples were collected in Williamson county on 9/11/16 to make observations for other fungal foliar leaf disease. Soybean rust was found sporulating in pustules on the bottom surface of the leaves.  The field was at R6 so yield loss to that field is unlikely.  While this very late in the season,  there are still many fields in southern Illinois that are  green and producers should consider scouting for soybean rust.

Bradley 2016

Picture 1: Soybean rust pustule sporulating. Photo courtesy of Carl Bradley, University of Kentucky Extension Plant Pathologist.

The IPM PIPE website shows soybean rust observations in North America (http://sbr.ipmpipe.org). Soybean rust sentinel plots and monitoring programs are no longer active in Illinois.  Any soybean leaves that are suspicious for soybean rust however, can be sent to the University of Illinois Plant Clinic (http://web.extension.illinois.edu/plantclinic/) for diagnosis. Further information on soybean rust can be found from this 2013 article http://bulletin.ipm.illinois.edu/?p=1501

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