Population quality, dispersal and numerical change in the gypsy moth, Lymantria dispar (L.).

First instars from small and large gypsy moth eggs differ significantly in their head capsule width, weight, hatching time and the length of thoracic setae. Pupal weight and the developmental period of immature stages of the gypsy moth originating from small or large eggs do not differ significantly. The mean number of eggs per mass produced by females originating from small eggs is greater than that of females from large eggs although not statistically significant. Highly significant differences in mean egg size of egg masses of each type of female were also observed. The relationship between egg size and dispersal strategies are discussed.