Abstract
Abstract By periodic sampling, seasonal patterns of the development of Fusarium root rot were studied in resistant and susceptible bean cultivars. Infection severity increased rapidly from the first sampling date, dropped off after the second or third, and again increased until the end of the season. In most cases, cultivar differences were apparent at any time after the second sampling, but resistant and susceptible cultivars could best be differentiated during the middle of the season. Sample variation was high, showing the potential for error in making single plant selections or in using small samples to compare cultivars.
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