As we progress through May, interest in the annual hatch of corn rootworm larvae increases. A quick review of the past 10 years reveals that hatch very often coincides with the Memorial Day weekend celebration:

These dates were arrived at by reviewing articles in “the Bulletin” and are largely based on observations by Larry Bledsoe, an entomologist at Purdue University. Larry spends time each spring looking for first-instar larvae that have tunneled into corn roots. Most of his root samples are collected from central Indiana. Although corn rootworm hatch occurs very often in late May, there have been exceptions. In 2001, hatch was very early (mid-May). In 1996 and 1997, hatch was delayed until mid-June. So we have a potential one-month range in which larval hatch may occur.

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