Epidemiology of soybean stem canker in the southeastern United States: relationship between time of exposure to inoculum and disease severity.

Reference Report for IND20377555

Title:	Epidemiology of soybean stem canker in the southeastern United States: relationship between time of exposure to inoculum and disease severity.
Authors:	Smith, E.F., Backman, P.A.
Source:	Plant Dis. 1989, 73(6):464-468
Abstract:	Severity of stem canker, caused by Diaporthe phaseolorum f.sp. meridionalis, was found to be primarily dependent upon plant growth stage at the time of exposure and was independent of planting date. The relationship between disease severity and the time of inoculum application was described by Cauchy distribution models. These models predict exponentially increasing disease incidence in plants exposed to inoculum from emergence to a max. for those exposed to inoculum at 22 and 24 d (V3 stage) postplanting. Plants exposed from the V3 stage to the V10 stage develop progressively less disease. Even a highly susceptible cultivar would not develop disease when exposed after the vegetative stages

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