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A Few Insect "Thumbnail" Reports

May 24, 2002
In this strange season, maybe a few "thumbnail" reports of insects are all we need. Most farmers have a lot more pressing issues on their minds. So, here's a quick overview of a few reports I have received:

· Check out "The Hines Report" ( for information about captures of armyworms, European corn borers, southwestern corn borers, and other moths. Ron continues to record "intense captures" of black cutworms, indicating that moths are still arriving on storm fronts passing through. However, reports of black cutworm problems are few and far between.

· White grubs are the subjects of most reports of insect damage in corn. Japanese beetle grubs have been particularly troublesome this year. Again, I remind you that there are no effective "rescue" treatments for white grubs. Chris DiFonzo, Extension entomologist at Michigan State University, wrote a nice piece about identification of different grub species in Michigan in the May 16, 2002, issue of MSU's Crop Advisory Alert. You can find the article at CAT02_fld/FC5-16-02.htm#2. Make certain you click on the links to the color fact sheet she has prepared. She arranged a nice series of white grub butts for your viewing pleasure.

· Although alfalfa weevils are still active, Zoophthora phytonomi epizootics seem to be wiping out weevil populations in many areas. Nevertheless, continue to scout for these pests in central and northern Illinois. I have received a couple of reports of "resurging" weevil problems--probably leftovers, but some larvae may be late hatchers from spring-deposited eggs.

· Matt Montgomery, Sangamon/Menard Extension unit educator in crop systems, has found a few potato leafhoppers in alfalfa. It's not surprising that they're here; they take advantage of weather systems, too. As most alfalfa growers know, shortly after alfalfa weevils let up, potato leafhoppers start to take over. I'll provide more information about potato leafhoppers in future issues of the Bulletin.

Don't hesitate to contact me if you find something that can be shared with others. Sometimes even the tiniest bit of information can be remarkably helpful.--Kevin Steffey

Author: Kevin Steffey

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

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