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Soybean White Mold
(Sclerotinia Stem Rot)
July 2016

By Damon Smith, Ph.D.
Assistant Professor
Extension Specialist
Department of Plant Pathology
University of Wisconsin-Madison
Phone: 608-262-5716


Executive Summary
(7 min 19 sec)

Full Presentation
(31 min 54 sec)


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Summary: Sclerotinia stem rot (SSR) or white mold of soybean is caused by the fungus Sclerotinia sclerotiorum. Sclerotinia sclerotiorum has a diverse host range, infecting many weedy plant hosts and crop plants. In the Northern U.S. SSR is a major disease of soybean. In years when average temperatures are cool (70 F) and there is frequent rains or high humidity, SSR can cause significant damage to soybean crops resulting in yield loss. For every 10% increase in plant death at the R7 growth stage, yield can be reduced 2 to 5 bu/a. This presentation will highlight recent research conducted to understand how SSR epidemics move in soybean fields, cause damage on soybeans, and how to manage the disease. The research presented here is partially funded by the soybean check off though the North Central Soybean Research Program and several state soybean associations including the Wisconsin Soybean Marketing Board.

Responsibility: United Soybean Board (USB) farmer-leaders develop and maintain partnerships with U.S. land grant universities and U.S. ag-focused research organizations such as the Plant Management Network to increase the transfer of checkoff-funded applied and practical production research information to U.S. soybean farmers. USB neither recommends nor discourages the implementation of any advice contained herein, and is not liable for the use or misuse of the information provided.

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