Rearing the Western Corn Rootworm in the Laboratory2

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Abstract
In tests conducted at Brookings, S. Dakota, during 1963, large numbers of eggs of the western corn rootworm Diabrotica virgifera, were collected and allowed to hatch in the laboratory. Adults caged in plastic or screen cages were fed immature ears of corn or the fruit of squash. Eggs were laid on removable strips of moist cellulose cotton. A period of cold at 4[degree]C caused diapause to break. Increasing the cold period up to 116 days shortened the incubation period necessary for eggs to hatch.

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