Abstract
This study was conducted to determine whether soybean (Glycine max) yield differs among soybeans nearly isogenic except for reaction to Microsphaera diffusa under a powdery mildew epidemic. Eleven isolines of cvs. Clark and Williams containing the powdery mildew reaction alleles Rmd-c (resistant), Rmd (adult-plant resistant), and rmd (susceptible) were evaluated for yield, lodging, height, seed quality, seed mottling, seed weight, and resistance to powdery mildew and brown stem rot. Isolines containing the resistance alleles Rmd-c and Rmd yielded 18% more than isolines containing rmd when stressed by a powdery mildew epidemic. The Rmd-c isolines yielded 7% more than the Rmd isolines
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