Status of First-Generation European Corn Borers

June 30, 2000
We still have heard very little in the way of significant numbers of first-generation European corn borers in 2000. I did receive a report from a consultant who covers Indiana and Ohio who found as much as 85 to 90% whorl-feeding injury and as many as three to four larvae per plant, but similar reports have not originated from anywhere in Illinois. We can count our blessings.

For the most part, the first generation of the European corn borer will come to an end soon in southern Illinois. Ron Hines, research agronomist at the Dixon Springs Ag Center, keeps track of heat-unit accumulations in his area of the world. He reported that accumulated heat units (base temperature 50°F) since May 9 (first capture of a moth in the spring) were about 1,050 on June 27. When about 1,192 heat units accumulate after the first occurrence of moths in the spring, we should expect to find adults that will begin laying eggs for the second generation. Egg hatch will begin when approximately 1,404 heat units accumulate after the first occurrence of moths in the spring. So emergence of moths that will give rise to the second generation of European corn borers is right around the corner. For the most part we escaped the first generation, but don't be lulled to sleep; the second generation still deserves our attention.--Kevin Steffey

Author: Kevin Steffey


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

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