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No. 09/May 22, 2003

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Update on Heat Unit Accumulations for Corn Rootworm Larval Hatch
There is no confirmation yet that corn rootworm larvae have hatched in Illinois, though reports from central counties are anticipated by late May. Hatch reports from northern Illinois are not anticipated until the first week of June.

Update on Stalk Borer Heat Unit Accumulations
Movement of stalk borer larvae from their weed hosts is under way across the southern half of Illinois. In extreme southern counties, the need for decisions about insecticide treatment is imminent.

Getting Reacquainted with Potato Leafhoppers
Potato leafhoppers, which have been spotted in several Illinois counties, can cause notable damage, though it may not become apparent for a few weeks. Alfalfa fields should be monitored weekly following the first cutting of hay. Scouting directions and recommended insecticides are outlined here.

First Flight of European Corn Borer Well Under Way in Southern Illinois
Early-planted corn is most at risk to economic infestations of first-generation European corn borers. The spring flight of European corn borer moths is under way in southern Illinois. Stay tuned for progress reports of the northward movement.

Corn and Soybean Injury Caused by . . . Slugs?
Though slugs will likely cause little injury in most fields, and both corn and soybeans can tolerate some injury from slugs, it is important to note that there are very few economically viable rescue treatments. Correct identification of any problems is key, as always.

Winter Wheat and Head Scab
Head scab is a key pathogen of soft winter wheat at this time of year. Symptoms, disease cycle, and management recommendations are discussed.

Corn Planting Winds Down for Most
A break in the wet weather pattern has finally allowed corn planting to begin in the last remaining parts of Illinois and to be finished up elsewhere. Potential problems resulting from planting into less-than-ideal conditions are described, along with commentary on crop development.

Regional Reports
Reports are provided this issue for southern and west-central Illinois.

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

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