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Update on Heat Unit Accumulations for Corn Rootworm Larval Hatch

May 29, 2003

Soil heat unit accumulations (base 52°) at the 4-inch level, from January 1 through May 26, 2003 (Figure 1), indicate that the corn rootworm larval hatch should be well under way throughout central Illinois counties. After 380 to 426 soil heat units have accumulated, from January 1, approximately 50% of corn rootworm larvae should have hatched. I do not anticipate reports of larval hatch in northern Illinois counties until sometime toward the end of the first week of June. A conversation with John Obermeyer, Purdue University entomologist, indicated that the hatch has yet to be confirmed in Indiana. However, he anticipates this event will occur within the next few days.--Mike Gray

Author: Mike Gray

The Pest Management and Crop Development Bulletin
Executive Editor: Kevin Steffey, Extension Entomologist

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