Resistance of 17 Soybean Cultivars to Foliar, Latent, and Seed Infection by Cercospora kikuchii . C. E. ORTH, Graduate Research Assistant, Department of Plant Pathology, Pennsylvania State University, Rm. 201 Buckhout Laboratory, University Park 16802. W. SCHUH, Assistant Professor, Department of Plant Pathology, Pennsylvania State University, Rm. 201 Buckhout Laboratory, University Park 16802. Plant Dis. 78:661-664. Accepted for publication 31 January 1994. Copyright 1994 The American Phytopathological Society. DOI: 10.1094/PD-78-0661.

Seventeen soybean (Glycine max) cultivars, representing maturity groups I to IV, were screened under greenhouse and field conditions for resistance to foliar and seed infection by Cercospora kikuchii. Although significant differences among cultivars in purple seed stain incidence, caused by C. kikuchii, were documented in greenhouse and field trials, predicting the ranking in cultivar resistance to purple seed slain under field conditions based on greenhouse results was largely unsuccessful. Four cultivars (BSR 101, Amsoy 71, Mack, and Miami) were consistently susceptible, and one cultivar (Resnick) was resistant to foliar infection in both greenhouse and field trials. However, significant differences in foliar disease severity were delected only in one of two field seasons. No significant differences in cultivar susceptibility to latent infections by C. kikuchii were detected in either the greenhouse or the field. The incidence of purple seed stain among 17 soybean cultivars was unrelated to disease development on the foliage