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Host Resistance and Pathogen Virulence in Pythium Blight of Bean. M. O. K. Adegbola, Research Assistant, Department of Plant Pathology, University of Wisconsin, Madison 53706; D. J. Hagedorn, Professor, Department of Plant Pathology, University of Wisconsin, Madison 53706. Phytopathology 60:1477-1479. Accepted for publication 5 May 1970. DOI: 10.1094/Phyto-60-1477.

Greenhouse and field studies of Phaseolus vulgaris strains and commercial cultivars showed that two beans were resistant to the Pythium blight disease. Bush Green Pod and N 203 withstood inoculation by five Pythium isolates, including the species P. debaryanum, P. aphanidermatum, and P. ultimum, whereas the Idaho Refugee cultivar was the most susceptible. Isolate H₂b of P. debaryanum was the most virulent isolate, inciting an average disease index of 56 in 31 bean cultivars.