Soybean Cultivar Reactions to Soybean Stem Canker Caused byDiaporthe phaseolorumvar.caulivoraand Pathogenic Variation Among Isolates

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Abstract
Twelve isolates of D. phaseolorum var. caulivora that cause stem canker disease of soybeans were compared for their relative virulence on field-grown plants of the soybean cultivars Tracy, Bragg and J77-339. A wide range of virulence was measured among isolates. The most virulent caused lesions with a mean length up to 61.9 cm at 60 days after inoculation; the least virulent caused lesions averaging 20.7 cm at 60 days. Differences in virulence of the pathogen are believed to contribute to observed variation in severity of the disease at different locations. Fifteen soybean cultivar resistant to stem canker disease were identified.

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