Crop Science Journal of Natural Resources and Life Sciences Education
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Published in Crop Sci 26:614-616 (1986)
© 1986 Crop Science Society of America
677 S. Segoe Rd., Madison, WI 53711 USA
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Yield Reductions Caused by Stem Canker in Soybean1

B. G. Harville, G. T. Berggren, J. P. Snow and H. K. Whitam2

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.

Key Words: Glycine max (L.) Merr. • Diaporthe phaseolorum var. caulivora Athow & Caldwell • Disease rating • Yield

1 Contribution from the Louisiana Agric. Exp. Stn., Baton Rouge, LA 70803.

2 Associate Professor, Dep. of Agronomy, associate professor and professor, Dep. of Plant Pathology and Crop Physiology, Louisiana Agric. Exp. Stn., Baton Rouge, LA 70803, and specialist, Plant Science Division, Coop. Ext. Serv. Serv., Baton Rouge, LA 70803, respectively.

Received for publication June 17, 1985.




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Copyright © 1986 by the Crop Science Society of America.