Reactions of Dry Bean, Lima Bean, and Soybean Cultivars to Rhizoctonia Root and Hypocotyl Rot and Web Blight

Abstract

We evaluated the reactions of 15 soybean, 13 dry bean, and two lima bean cultivars to Rhizoctonia root and hypocotyl rot and web blight. Each cultivar was inoculated separately with Rhizoctonia solani isolates AG-2-2 and AG-4 to evaluate resistance to root and hypocotyl rot and with a dry bean isolate and a soybean isolate of AG-1 IB to evaluate resistance to web blight. Agar plate, potted plant, detached leaf, and whole plant assays were used to evaluate resistance. Data from agar plate and potted plant assays for hypocotyl and root rot were either not correlated or were only weakly correlated. This indicated that agar plate assays were not satisfactory for determining differences in host resistance and that investigations should be based on potted plant assays (.)