Sightings of western corn rootworm adults were reported for the first time in many areas of central and western Illinois during the past week, according to the latest U of I IPM Bulletin.

Matt Montgomery, crop systems educator, Sangamon-Menard Extension unit, observed western corn rootworm adults for the first time near Havana in Mason County on June 17. Will Mullenix, technical support agronomist, Channel Bio Corp., reported finding a western corn rootworm adult in central Christian County on June 17. He also observed larvae (second and third instars) feeding on brace roots.

Growmark’s Kevin Black reported that Jerry Harbour and Denny Kopp, certified crop specialists with Lincoln Land FS, found corn rootworms in several developmental stages (third instars, pre-pupae, and pupae) near Auburn in Sangamon County. They also indicated that corn planted as a refuge was severely lodged in one field they scouted.

Insect pest overview

On June 20, extension entomologists from across the Midwest convened during a teleconference to share information about insect situations and issues in their respective states. Here’s a synopsis of Illinois conditions from U of I entomologists Mike Gray and Kevin Steffey:

• Western corn rootworm adults beginning to emerge.
• Large numbers of Japanese beetles emerging, especially in southern Illinois.
• Low numbers of soybean aphids.
• Low numbers of European corn borers.

Full report on rootworm sightings »

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