Abstract
Development of damping-off epidemics, caused by a random distribution of Pythium aphanidermatum in soybean populations, was quantified in even-aged and mixed-aged populations of Glycine max and Glycine soja (progenitor of cultivated species). Age structures were created to mimic naturally occurring even- and mixed-aged structures of G. max and G. soja, respectively. Damping-off epidemics developed more rapidly in populations of G. max than G. soja, in mixed-aged than even-aged populations of G. max, and even-aged than mixed-aged populations of G. soja. Diseased soybeans were distributed less uniformly, both temporally and spatially, and epidemics were longer in mixed-aged than even-aged structures and in populations of G. soja than G. max. Incidence of preemergence disease was greater near the inoculum source. Seedlings that damped-off after emergence and (or) those that remained symptomless were peripheral to the inoculum source. Epidemic development was dependent upon plant species and the temporal and spatial distribution of susceptible plants and virulent pathogen. Key words: Glycine max, Glycine soja, Pythium aphanidermatum, soybean, survivorship analysis.
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