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Resistance

A Seedling Test for Resistance to Soybean Stem Canker Caused by Diaporthe phaseolorum var. caulivora. B. L. Keeling, Research plant pathologist, U.S. Department of Agriculture, Agricultural Research Service, Southern Region, P.O. Box 196, Stoneville, MS 38776; Phytopathology 72:807-809. Accepted for publication 6 November 1981. This article is in the public domain and not copyrightable. It may be freely reprinted with customary crediting of the source. The American Phytopathological Society, 1982.. DOI: 10.1094/Phyto-72-807.

Host-plant resistance to stem canker caused by Diaporthe phaseolorum var. caulivora in soybean (Glycine max) seedlings was detected in greenhouse tests. The reaction of 10-day-old seedlings to the disease was compared with disease development on artificially inoculated field-grown plants and with the occurrence of stem canker on plants subjected to natural disease development. Good agreement was found between the seedling response to artificial inoculation, the response of artificially inoculated field-grown plants, and the incidence of naturally occurring disease.