Epidemiology of Verticillium Wilt of Potato: Spatial Patterns of Soilborne Verticillium Dahliae and Incidence of Stem Colonization |
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10g subsamples 1983 growing season 1ml aliquots analysis of variance Andersen sampler average soil inoculum base CFU counts coefficient commercial potato fields detected dilution plating technique disease early dying estimates of inoculum field soil four commercial potato fumigated fungus hypothesis incidence of stem individual quadrats infection by Verticillium infested soil samples large study areas levels of Verticillium medium microsclerotia naturally infested soil number of Petri number of propagules observed pathogen Petri plates Phytopathology Poisson distribution Pratylenchus penetrans precision present study probability of stem propagules per gram random relationship Russet Burbank potatoes sample mean sample of soil samples taken small study areas soft-rot Erwinia soil assay soil inoculum density soil inoculum levels soil samples assayed spatial autocorrelation spatial patterns square-root transformed standard error stem colonization stem infection Table Thesis three commercial potato University of Wisconsin-Madison vascular bundles infected Verticillium albo-atrum Verticillium dahliae Verticillium wilt wilt of potato