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Effects of Cercospora kikuchii on soybeans. J. R. Wilcox, Research Geneticist, Agricultural Research Service, U.S. Department of Agriculture, Purdue University, West Lafayette, Indiana 47907; T. S. Abney, Professor of Agronomy and Assistant Professor of Botany and Plant Pathology, Purdue University, West Lafayette, Indiana 47907. Phytopathology 63:796-797. DOI: 10.1094/Phyto-63-796.

Effects of Cercospora kikuchii, the causal organism of purple seed stain of soybeans, were investigated on the varieties ‘Amsoy’, ‘Shelby’, ‘Lindarin 63’, ‘Wayne’, ‘Clark 63’, and ‘Cutler’. Seedling emergence from purple-stained seeds averaged 5 percentage points lower than that from seed free of purple stain in sandbench tests. Emergence of seedlings from purple-stained seed planted in the field averaged from 7 to 13 percentage points lower than from seed free of purple stain at Worthington, Indiana, and from 10 to 15 percentage points lower at Lafayette, Indiana. Incidence of purple seed stain had no effect on maturity, lodging, plant height, or seed yield in these tests. Incidence of the disease in harvested seed did not differ appreciably between plots planted with purple-stained and purple-stain-free samples.

Additional keywords: purple seed stain, seedling emergence.