Innate Capacity of Increase and Ovipositional Pattern of the Green Cloverworm 12

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Abstract
The innate capacity of increase was calculated for cohorts and isolated individuals of the green cloverworm, Plathypena scabra (F.). Colony and midseason field-collected cohorts were similar, as were early-season and late-season field-collected cohorts. Similarities were: percentage individuals in prereproductive and reproductive periods, age-distribution patterns, realized sex ratio, and seasonal abundance records for field-originated cohorts. Calculated rates of increase were used to estimate numbers of females needed at initial invasion of Iowa agroecosystems to cause economic losses later in the season. Two methods of simulating ovipositional pattern were advanced to contribute to predictive population models.

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