Partial Life Tables of the Green Cloverworm (Lepidoptera: Noctuidae) in Soybean and a Hypothesis of Population Dynamics in Iowa 1

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Abstract
Studies were conducted during the growing seasons of 1977 through 1980 near Ames, Iowa, to understand the population dynamics of the green cloverworm in soybean. Adults and larvae were sampled ca. three times a week, and companion studies allowed the assessment of predator populations, parasitization, and disease incidence. Populations of both endemic and outbreak configurations were observed, and partial life tables for each of two generations were prepared for each year. A graphical analysis of individual mortality factors from the life tables indicated that larval disease caused by Nomuraea rileyi (Farlow) was an important limiting factor of seasonal density in outbreak years. In endemic years, parasitoids were significant, but their action was dominated by larval disease during green cloverworm outbreaks. A hypothesis that explains population configurations of green c1overworms in soybean is suggested.

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