Issue No. 17, Article 6/July 15, 2005
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.
Hurricane Dennis brought much-needed rain. The heaviest amounts were centered around McLean County and northern Champaign County, with some areas receiving more than 2 inches. Most of the area received at least 1/2 inch.
The rains may have been too late to help some cornfields that had already tasseled at only chest-high levels. Huge western corn rootworm and Japanese beetle populations were preventing pollination in some fields. Sprayers were busy spraying cornfields for rootworms and soybean fields for spider mites.
Scattered light precipitation occurred on Tuesday, July 12, with several individuals reporting accumulation of less than 0.1 to 0.2 inch. Widespread tasselling is occurring in the region, with many individual fields very uneven in tassel emergence, especially continuous corn. Growers are encouraged to closely monitor cornfields for silk clipping by corn rootworm beetles and Japanese beetles. There have been no confirmed reports of fields treated with an insecticide to protect silks, but that could change by the end of the week.
Numerous reports have been received concerning "cupped" soybean leaves. Herbicide drift has been confirmed as not the cause for some of the fields with "cupped" leaves. Soybean aphids are still present in many fields, but populations appear not to have increased over the last few weeks. Also, spider mite populations have remained constant.
Some producers are beginning to supplement pastured livestock with hay.
Much of southern Illinois received 1 to 2 inches of rain on July 11. It was a nice, slow rain that benefited crops immensely. Corn is VT to R3, and many fields can now be checked for pollination. Soybeans are Vn to R3 and have jumped in height.
It worked last weekÑthanks for the rain; send more!
Upcoming field days: Brownstown, July 28; Dixon Springs, August 4.
Parts of the area received much-needed rainfall since the beginning of the week. Reports vary from several tenths of an inch to nearly 2 inches in areas farther south.
Pollination progress ranges from complete to nearly complete as you move from the southern to northern part of the region. Corn rootworm adults continue to be of concern in some areas. Numerous fields have already been aerially treated because of the high number of beetles, with reports of 10 to 50 beetles per plant. Areas that received rainfall this week and on the 4th of July will undoubtedly see a benefit to kernel fill.
Soybeans range from very short in more drought-stricken areas to well canopied in some parts. Spider mites continue to be found in soybean fields, with scattered reports of producers applying treatments. Many producers are now waiting for a response to the rain before proceeding with any additional controls.
Pastures are completely dried up, and producers have started using supplemental feed sources such as hay and corn in much of the region. Matt Montgomery, crop systems educator in Sangamon-Menard counties, reports pea aphids at threshold levels being found in alfalfa. Potato leafhoppers also continue to be a concern in some alfalfa fields.