Resistance to Rhizoctonia Stem Rot in Peas as Influenced by Temperature, Watering Method, and Period of Disease Development

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Abstract
Under controlled environmental conditions, disease severity of susceptible and moderately resistant pea cultivars to R. solani AG4 varied with temperature, period of disease development, and method of watering. The distinction between susceptible and moderately resistant plants was difficult to determine when plants were kept either under high temperature and high soil moisture for a long period or under low temperature and high soil moisture for a short period. A breakdown of the moderate resistance to this disease occurred under environmental conditions that favored the pathogen more than the host. Seedlings of a susceptible and of a moderately resistant cultivar of different ages (1, 2 and 3 wk) gave the same disease reaction. The maturing pea stem apparently did not develop disease resistance.