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Relationship between soil moisture and occurrence of sclerotinia sclerotiorum and white mold disease on snap beans phaseolus vulgaris



Relationship between soil moisture and occurrence of sclerotinia sclerotiorum and white mold disease on snap beans phaseolus vulgaris



Protection Ecology 7(4): 269-280



Twelve snap bean fields were monitored weekly during the growing season in 1978, 1979 and 1980 for environmental and biological factors associated with deposition of inoculum of S. sclerotiorum on bean leaves and incidence of white mold. The soil matric potential (.psi.m) in and around bean fields was measured with a portable, quickly equilibrating tensiometer. Contingency tables and a nonparametric statistical test called the phi coefficient were used to determine which .psi.m best predicted the occurrence of inoculum and disease. The average of the .psi.m measurements made 30 and 37 days, or 37 and 44 days after planting wsa a good predictor of availability of inoculum during bloom (the susceptible period) and disease at harvest. Rainfall was not as good a predictor. For snap bean growing areas with a history of white mold, a proposal is made that disease be anticipated whenever the average .psi.m is .gtoreq. -30 kPa [kilopascal] to for a 1- to 2-wk period just prior to or during bloom. The feasibility of using an ascospore production forescast compared to a disease forecast in a practical pest management program is discussed. Ways to improve these types of forecast also are considered.

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