Cannibalistic immatures of the gypsy moth (Lymantria dispar L. [Lepidoptera: Lymantriidae]) predator Calosoma sycophanta L. (Coleoptera: Carabidae) must usually be reared individually. This paper describes a method of rearing C. sycophanta larvae in groups by placing them in plastic containers having 3 cm of moist peat moss in the bottom. Larvae are fed gypsy moth pupae placed on top of the peat moss. Under these conditions, larval mortality is about 50%. By varying the number of prey, it was found that larval mortality increased if less than 0.5 pupae/day/larvae were provided. However, when not starved, at least 40 C. sycophanta larvae can be reared per container with no increase in mortality. Larvae were seen to burrow through the peat moss extensively, which may reduce cannibalism. Higher larval mortality occurred when using paper towelling (wet or dry) as the substrate. Group rearing will make it easier to supply beetles for augmentative releases against the gyspy moth.

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