Submitted to: Meeting Abstract
Publication Type: Abstract Only
Publication Acceptance Date: 6/10/1997
Publication Date: N/A
Technical Abstract: Sclerotinia stem rot (SSR) of soybean is an important disease in some northern soybean production areas in the U.S. Five maturity group III cultivars, Asgrow A3304 STS, Pioneer Brand 9342, Pioneer Brand 9381, Probst, and Yale were planted, subdivided into plots based on SSR incidence levels, and harvested in east-central Illinois. All cultivars had significant yield reductions, and for every 10% increase of SSR incidence, there was an average of 277 kg ha-1 loss over combined cultivars. Probst had the lowest yield reduction (15 kg ha-1 per 1% SSR incidence), and the smallest SSR incidence range (2 to 45%). Within each cultivar and combined cultivars, there were some significant correlations between SSR incidence and 100 seed weight, seed protein and oil content, visual seed quality, seed germination, and the number of sclerotia found in a 300 g sample. Results indicate that SSR affected the yield of all soybean cultivars and partial resistance may exist in some cultivars.