Relationships between mean egg weight and overwintering survival in the laboratory were explored in selected large- and small-egg lines and also in first laboratory generations from 5 widely separated locations. Overwintering stress was provided by prolonged storage or above average storage temperature. Under stress large eggs were shown to have greater survival than small eggs in both stocks of insects. The results explain why spruce budworm from higher latitudes (longer winters) have heavier (larger) eggs. Other effects of prolonged storage and storage selection on subsequent size and development rates in both the treatment and the F1 generations are reported.
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G. T. Harvey (1985) studied this question.
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