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Nature and Epidemiological Significance of Infection of Bean Seed by Whetzelinia sclerotiorum. J. R. Steadman, Associate Professor of Plant Pathology, University of Nebraska, Lincoln 68503; Phytopathology 65:1323-1324. DOI: 10.1094/Phyto-65-1323.

Whetzelinia sclerotiorum was isolated from 48% of seed lots of bean cultivars Great Northern and Pinto harvested from white-mold-infected plants, but from only 6% of seed lots harvested from healthy-appearing plants in western Nebraska. The fungus was recovered from less than 0.5% of normal seed, but from nearly 12% of chalky, discolored, and shrivelled seed. Infected lots of seed planted in sterilized soil in a greenhouse humidity chamber did not produce white-mold-infected bean plants. Seeds infected with Whetzelinia sclerotiorum did not germinate in vitro. Whetzelinia sclerotiorum can be disseminated in seed, but this is unlikely to be of epidemiological significance.

Additional keywords: Sclerotinia sclerotiorum, Phaseolus vulgaris.