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Regional Reports

July 26, 2002
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. 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, Richland, 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.

East-Central Illinois

After a week of sparse showers, a large rain event finally moved through the area on June 22, but still rain totals ranged from .25 inch to more than 3 inches in some areas. This should at least temporarily alleviate drought stress in much of the area. A lack of corn brace root development led to lodging in the areas with the most severe storms. Pollination is still under way in many cornfields.

Prior to the rain, reports of drought-related insects, such as aphids and spider mites, had been escalating rapidly.

Northern Illinois

Dry conditions persist throughout the region. A large portion of the corn acreage was in full tassel by late last week. The moisture stress and recent high temperatures will have a detrimental effect on yield, but to what degree is unknown at this time. Reports have been received of several fields in LaSalle County being treated for silk clipping by rootworm beetles. We continue to receive reports of rootworm larvae feeding in first-year corn roots in LaSalle County.

Spider mite damage has been observed in soybean field margins in the dryer area of the region, which appears to be northeast Illinois. However, no one has reported treating fields for spider mite damage. Bean leaf beetles are present throughout the region in soybeans, but, to date, leaf feeding is below economic levels. Gary Brethauer, Kendall County Extension educator, reports observing soybean aphids in numerous Kendall County fields, but populations have not reached large numbers yet.

West-Central Illinois

Storms rolled through the middle of the region on Monday, bringing desperately needed precipitation to some areas. However, accompanying winds and spotty hail caused significant damage to many cornfields in parts of Cass, Fulton, Morgan, and Menard counties. Other areas, particularly in the northern and southern sections of the region, have remained relatively dry despite scattered showers received late last week.

Crop condition and progress vary within the region. Early-planted corn is in the milk stage, and the abortion of kernels on ear tips and poor pollination are evident in some fields. Some corn has yet to pollinate, and soybean growth stages range anywhere from beginning bloom to beginning pod.

Some reports of light to moderate western rootworm beetle infestations are coming in, but feeding damage appears to be light. One report was received of the presence of Japanese beetles in Adams County, but the area of infestation is currently confined to a very small geographic area.

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

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