Abstract
Stem canker (caused by Diaporthe phaseolorum var. caulivora Athow & Caldwell) was first observed in Louisiana on soybean [Glycine max (L.) Merr.] near Rosa in 1981. In 1982, several thousand hectares of soybeans were damaged in the southern part of Louisiana, some of which were heavily damaged. The objective of this study was to assess the extent of yield reductions of soybean cultivars caused by stem canker in Louisiana. Thirty‐two cultivars were field grown in Olivier silt loam (fine‐silty, mixed, thermic Aquic Fragiudalfs) soil. They were grown in a randomized complete block design with four replications. A wide range of responses was observed; several cultivars from Maturity Groups V through VIII were resistant to the disease. Significant negative correlations occurred between yield and disease ratings among cultivars and maturity groups. This study indicated several cultivars that should not be grown in soil where the stem canker organism is known to be present and identified other cultivars that could possibly be grown in the presence of the stem canker organism.
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