Cultivar Resistance to Field Infestations of Soybean Stem Canker

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Abstract
A total of 41 adapted soybean [Glycine max] cultivars were evaluated for resistance to stem canker caused by Diaporthe phaseolorum var. caulivora in naturally infested fields, and effects of the disease on seed yield were determined. In 2 yr of field evaluations, almost all adapted soybean cultivars were susceptible to stem canker. Disease expression among cultivars varied from highly resistant to highly susceptible, with most cultivars between these extremes. Braxton and Tracy-M were virtually immune, whereas Hutton, Coker 237, and other cultivars were highly susceptible. Seed yield was negatively correlated with disease severity in all environments.

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