Survival of Northern Corn Rootworm Eggs Through One and Two Winters1

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Abstract
Northern corn rootworm, Diabrotica longicornis (Say), eggs were placed in the ground at different depths. The survival of these eggs through 1 and 2 winters was studied. The following facts were established: (1) Some eggs were destroyed during the winter so they had disappeared by spring. (2) Some eggs were adversely affected physiologically so they did not hatch in the spring. (3) Both these adverse effects were more severe among eggs located near the ground surface. (4) A small percentage of eggs did not hatch during the growing season following the fall of oviposition, and stayed viable through the second winter. Most of these eggs were located below 4 in. in the soil.

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