Issue No. 18, Article 10/July 25, 2008
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.
Corn began to tassel throughout the region last weekend. Most of the area received at least 1.5 inches of rain during the week of July 14.
Extension educators monitoring western bean cutworm traps in northwest Illinois reported multiple moth captures and some very high counts July 18 through July 22 in Carroll, Whiteside, Ogle, and Lee counties. It is the third year of this monitoring project, and this week had the most consistent and the highest moth trap numbers that have been reported in the northwest portion of the region.
Japanese beetles are abundant in ornamentals and soybeans, and they are beginning to migrate to corn silks, which makes everyone very nervous. Japanese beetle populations are very low in the northeast area and heaviest in the central to southwest portion of the region. Some reports have been received of insecticide treatment in soybeans, which may not be warranted as the economic threshold is 20% defoliation in soybeans at full bloom.
Aerial fungicide application has begun in the southern portion of the region.
Typical July temperatures in the mid-90s are placing stress on the "early"-planted corn fields that are in the process of pollination. Late-planted corn won't begin pollination until early August. Japanese beetles are the primary insect causing problems in both corn and soybean fields. With the advent of hot, dry weather, pasture conditions are beginning to deteriorate.
The Brownstown Agronomy Research Center Field Day will be held on Thursday, July 31, beginning at 9:00 a.m. A free lunch will be provided, and 2.5 hours of CCA-CEU credit have been applied for. In order to beat the heat, the last tour will start no later than 9:30, so be sure to come early. Maps to the research center and the full agenda can be found on the research center Web site.