Issue No. 11, Article 7/June 9, 2006
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.
The past week's field activities focused on sidedressing anhydrous ammonia, applying postemergent herbicide on corn and soybeans, and finishing hay harvesting. Alfalfa hay harvest this past week has been difficult due to scattered showers. The earliest-planted corn is at V7, and most corn throughout the region during the past week has shown considerable growth.
Numerous reports have been received concerning bean leaf beetles feeding on soybeans, but no reports of economic damage. Soybean leaf damage from bean leaf beetle feeding has become less evident as soybeans have displayed additional trifoliate leaves. Bill Lindenmier, crop systems educator, reported several situations of black cutworm larvae feeding on corn in Ogle County.
Russ Higgins, IPM educator, reports large populations of potato leafhoppers during hay harvesting. Russ also reports grass has begun to go dormant in areas of Grundy County.
Rainfall amounts throughout the southern region continue to be erratic. In the past week, some areas received nearly 3 inches, while others received only .3 inch. In those areas that received little rain, crops are beginning to show signs of moisture stress during the heat of the day.
The spread in corn planting dates is becoming more obvious. The earliest-planted fields are at least V10 and nearly shoulder tall, while late-planted fields are only at V4. Late-planted fields are still at risk from black cutworm and should continue to be monitored. Japanese beetle adults will begin emerging over the next few weeks, just in time for silk emergence on early-planted corn.
Wheat has reached physiological maturity and now only needs drying time. By this time next week, harvest should be under way. Some full-season soybean planting continues and will probably overlap somewhat with double-cropped planting, which is pretty typical for most years.
Second cutting of alfalfa is under way, and crop conditions look excellent. Potato leafhoppers are now present and will be for the remainder of the summer. Growers should be monitoring each cutting and treating the problem as thresholds are reached.
Corn in the west-central region varies in growth stage from V4 to V7, with most near the V6 stage. As a whole, the corn crop looks good, but there are areas that show stunting and damage from such things as too much moisture, herbicide damage during cool or hot conditions over the past few weeks, and wireworms.
Soybean is about 99% planted, with most emerged. The most advanced fields are at the V4 stage. Early-emerged fields were hit with bean leaf beetles, but not to the extent of needing to be sprayed. Stands are good to spotty, depending on rainfall amounts, which in different areas of the region varied from 1/2 inch to over 5 inches.
Wheat fields have been showing scab for about the past week. Scab looks to be significant in some fields that were in wetter areas, with up to 25% loss in the worst fields.
Alfalfa fields are being treated for potato leafhoppers. Some fields have very high populations. Scouting is a must.