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Regional Reports

July 17, 2003

Extension center educators, unit educators, and unit assistants in northern, west-central, east-central, and southern Illinois prepare regional reports to pro-vide 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. The regions have been defined broadly to include the agricultural statistics districts as designated by the Illinois Agricultural Statistics Service, with slight modifications:

North (Northwest and Northeast districts, plus Stark and Marshall counties)

West-central (West and West Southwest districts, and Peoria, Woodford, Tazewell, Mason, Menard, and Logan counties from the Central district)

East-central (East and East Southeast districts [except Marion, Clay, Rich-land, and Lawrence counties], McLean, DeWitt, and Macon counties from the Central district)

South (Southwest and Southeast districts, and Marion, Clay, Richland, and Lawrence counties from the East Southeast district)

We hope these reports will provide additional benefits for staying current as the season progresses.

Northern Illinois

Scattered thunderstorms occurred al-most daily throughout the region from July 5 through July 11. In some areas, the thunderstorms were accompanied by high winds and hail. Much of the earlier-planted corn began to tassel from July 11 through July 15. As corn begins to silk, there is concern about potential silk clipping from rootworm beetles and Japanese beetles. Producers are encouraged to scout fields for possible silk clipping, particularly in areas of large populations of Japanese beetles.

Insect activity has begun to increase throughout the region. Lodged corn from high winds experienced on July 8 has "goosenecked" back up to nearly erect. However, on further investigation of lodged corn located in LaSalle and Putnam counties, there has been confirmed rootworm larvae injury in first-year corn, which had granular insecticide applied at planting.

We have received numerous reports early this week of yellow, chlorotic soybeans throughout the region. Numerous causes reported include manganese or iron deficiencies, field ponding, and soybean cyst nematode infestations. Also some chlorotic fields have rhizoctonia root rot as well. Soy-bean aphids have been reported from several northeastern counties. However, there have been no reports of insecticide treatment.

West-Central Illinois

Most of the region received much-needed rainfall from several different storms that passed through the region last week. In some areas, winds and hail caused some damage to both soy-beans and corn, but extensive damage was localized to relatively small areas.

Rainfall received in combination with favorable temperatures has resulted in excellent conditions for pollination. The probability of an excellent corn crop is high at this point. Most of the corn is actively pollinating, and some of the earlier-planted corn is as far advanced as R3 (milk stage). Soybeans also look very good in most areas, and are in full bloom.

Wheat harvest is complete, and reports of yields in the 80- to 100-bushel-per-acre range are very common. Double-cropped soybeans have emerged quickly with the recent rains and appear to be off to a good start.

Developments in insects and diseases have been relatively minor, but reports of the presence of Japanese beetles have been made in some areas of the region where they had not been noticed in past years, Quincy and Macomb in particular. In addition, a number of alfalfa fields that were harvested within the past few weeks have been recently sprayed for potato leafhopper.

Author:


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

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