Difference in Pathogenicity of Phialophora gregata Isolates from Adzuki Bean in Japan and from Soybean in the United States. Kiroku Kobayashi, Department of Botany, Faculty of Agriculture, Hokkaido University, Sapporo 060, Japan. Norio Kondo, and Tadao Ui, Department of Botany, Faculty of Agriculture, Hokkaido University, Sapporo 060, Japan; Hideo Tachibana, Department of Plant Pathology, Seed and Weed Sciences, Ames, IA 50011; and Tatehiko Aota, Hokkaido Tokachi Agricultural Experiment Station, Memuro 082, Japan. Plant Dis. 67:387-388. Accepted for publication 11 September 1982. Copyright 1983 American Phytopathological Society. DOI: 10.1094/PD-67-387.

Pathogenicity tests of the isolates of Phialophora gregata from adzuki beans (Phaseolus angularis) in Japan and from soybeans (Glycine max) in the United States were conducted in naturally infested fields in Japan and in the United States in 1980 and 1981. An adzuki bean isolate in Japan and a soybean isolate in the United States differed in their ability to infect and incite brown stem rot in each host.