Purple Seed Stain of Soybeans

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Abstract
Field plantings of 4 genetically different soybean [Glycine max] lines were inoculated with Cercospora kikuchii. Inoculations at different stages of host development in the same environment and inoculations at similar host stages in varying environments were compared. Incidence of purple-stained and total infected seed was not correlated with the length of the flowering period, but it was affected by weather conditions at the time of inoculation. Young pods were more susceptible to infection than old pods. Inoculated plants matured earlier, had smaller seed and yielded less than noninoculated plants. Seed infection resulting from C. kikuchii inoculations in different environments at the full-bloom stage of host development ranged 3-30% for P.I. 80837, the most resistant entry, and 30-85% for ''Amsoy'', the least resistant soybean entry. Soybean entries differed in the expression of purple stain in infected seed.

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