Reference Report for IND93025138
| Title: | Reactions of dry bean, lima bean, and soybean cultivars to rhizoctonia root and hypocotyl rot and web blight. |
| Authors: | Muyolo, N.G., Lipps, P.E., Schmitthenner, A.F. |
| Source: | Plant Dis. 1993, 77(3):234-238 |
| Abstract: | Reactions of 15 soyabean, 13 Phaseolus vulgaris and 2 P. lunatus cultivars to R. root and hypocotyl rot and web blight (all caused by R. solani) were evaluated. Each cultivar was inoculated separately with R. solani AG-2-2 and AG-4 to evaluate resistance to root and hypocotyl rot and with a P. vulgaris isolate and a soyabean 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. It is suggested that agar plate assays are not satisfactory for determining differences in host resistance and that investigations should be based on potted plant assays. With a few exceptions, all soyabean cultivars were resistant or moderately resistant to hypocotyl and root rot in potted plant assays. Of the Phaseolus cultivars tested, only Jackson Wonder (P. vulgaris) was moderately resistant to both diseases. In potted plant assays, hypocotyl and root disease severities were positively correlated for soyabean and P. vulgaris (r=0.67 and 0.71, respectively; P≤0.01). It is concluded that cultivars may express a similar reaction to both diseases. Soyabean cultivars were more resistant to web blight than P. vulgaris cultivars. Web blight ratings from the detached leaf and whole plant assays were correlated for soyabean but not for P. vulgaris or P. lunatus |
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