Soil Temperature Environment of Overwintering Western Corn Rootworm 1 Eggs 2

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Abstract
Soil temperatures were monitored at two depths in the plow layer during the prediapause and diapause-chill quiescent stages of the western corn rootworm, Diabrotica Virgifera virgifera LeConte, for four years at Brookings, SD. Soil tempratures descended below the threshold for development (11°C) in early October and remamed <0°C until early March. Each year, eggs at both depths were subjected to a minimum of 14 weeks at temperatures <0°C. In laboratory tests, hatch declined significantly with time at −7.5°C and −10°C.