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United States Department of Agriculture

Agricultural Research Service

Title: Sclerotinia Sclerotiorum: Variation in Aggressiveness and Screening Soybeans for Resistance

Authors
item Kull, L - U OF ILL, URBANA
item Hartman, Glen
item Manandhar, J - U OF ILL, URBANA
item Pedersen, Wayne - U OF ILL, URBANA

Submitted to: Soybean Research World Conference Proceedings
Publication Type: Abstract Only
Publication Acceptance Date: July 21, 1999
Publication Date: N/A

Technical Abstract: Sclerotinia stem rot on soybeans was first identified in the US in 1946 and now occurs widely in the north central region as seen by recent epidemics. In general, changes in farming practices and/or adaptation within the pathogen population may have contributed to the increased occurrence of SSR. Our research has focused on screening available soybean germplasm for resistance to SSR, crossing resistant germplasm into agronomically desirable soybean varieties, and determining aggressiveness levels within the pathogen population. Aggressiveness of 18 geographically diverse isolates from various hosts and 35 isolates collected from two soybean fields in Illinois resulted in a wide range of aggressiveness levels among isolates within each group. The USDA germplasm collection including accessions of Glycine max, G. soja, and perennial Glycine species, were screened for resistance to SSR. A number of potentially new sources of resistance were found in at least some of these sets. Most of these sources of resistance are being field-screened.

Last Modified: 12/20/2014
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