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No. 10/May 31, 2002

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Correction: Degree-Day Maps in Bulletin Issue No. 9, May 24, 2002
The captions for the degree-day maps on page 98 of the print version of the Bulletin (issue no. 9, May 24, 2002) were inadvertently transposed. The caption for Figure 1 actually describes the information in Figure 2, and vice versa. In other words, the captions for Figures 1 and 2 should be exchanged. We regret the error.

A Summary of the Insect Situation
The persistent wet, cool weather has slowed down crop growth (and production in some areas) so dramatically that we find ourselves at a virtual standstill regarding insect problems. This article contains an overview of the insect situation in Illinois, such as it is, by crop. Insects mentioned include the following:

Corn: corn rootworms, cutworms, European corn borer, southwestern corn borer, stalk borer, white grubs, wireworms,

Soybeans: bean leaf beetle, seedcorn maggot

Alfalfa: alfalfa weevil, potato leafhopper

Phytophthora and Pythium Seed Rot and Damping-Off of Soybean in Illinois
Field conditions in much of Illinois are prime for damage to soybeans caused by Phytophthora and Pythium. This article covers basic aspects of Pythium and Phytophthora diseases of soybean and their management, and briefly discusses some new research on Phytophthora rot of soybean in Illinois.

Corn Stage Is Critical for Postemergence Herbicide Applications
Due to early-season conditions, the Illinois corn crop is at several different stages, with corn sizes ranging from emergence to growth stages critical to postemergence herbicide applications. Issue no. 6 of the Bulletin addressed the use of soil-applied herbicides after corn emergence to control early-emerging weeds and the critical timing associated with this practice. However, this window has closed in many areas of the state, and we need to look at postemergence herbicides to control later-emerging grass and broadleaf weeds.

Replanting Question Continues
While the return to warmer temperatures has the existing corn crop looking much better this week, we have received some rather unexpected reports that frost damage resulted in extensive plant death in some areas and that replanting will be needed in some of these fields.

While the extensive rainfall has hammered the wheat crop this spring, the crop seems to be holding its own, with diseases likely present but not spreading very rapidly due to cool temperatures.

Regional Reports
Extension Center educators, Unit educators, and Unit assistants in northern, west-central, east-central, and southern Illinois prepare regional reports to provide more localized insight into pest situations and crop conditions in Illinois. The reports will keep you up to date on situations in field and forage crops as they develop throughout the season.

This week's issue includes reports from northern and west-central Illinois.

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

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