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Published in Crop Sci 8:728-729 (1968)
© 1968 Crop Science Society of America
677 S. Segoe Rd., Madison, WI 53711 USA
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Resistance to Brown Stem Rot in Soybeans1

D. W. Chamberlain and R. L. Bernard2

A total of 2,060 soybean strains, screened for resistance to brown stem rot, revealed no immune lines. However, PI 84946-2, a strain of unknown origin selected from an introduction from Korea, had a very high proportion of disease-free plants through 12 seasons. When crosses of PI 84946-2 were made with several commercial varieties, the segregating generations averaged more healthy plants than did the commercial varieties. Lines with resistance similar to that of PI 84946-2 have been selected from these populations.

We observed that early-maturing varieties tended to escape infection; locally adapted varieties planted in late June did likewise.

Irradiating the seeds of six soybean varieties with thermal neutrons failed to induce resistant mutants in progeny tests.

Key Words: Cephalosporium gregatum • Glycine max (L.) Merr

1 Cooperative investigation, Crops Research Division and Illinois Agricultural Experiment Station. Paper No. 514, U. S. Regional Soybean Laboratory, Urbana, 111.

2 Research Plant Pathologist and Research Geneticist, respectively, Crops Research Division, Agricultural Research Service, U. S. Department of Agriculture, Urbana, 111. 61801.

Received for publication May 22, 1968.




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