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 region received variable amounts of rainfall last Monday evening through Tuesday, with reported amounts from 0.1 inch to more than 5 inches.
Additional reports have been received concerning rootworm larvae damage in first-year corn in LaSalle County. Incomplete pollination has been observed in numerous fields from previous silk clipping by rootworm beetles.
Insecticide treatment for spider mite infestation continued throughout the region, with most treated acreage being border rows and a few entire fields. Spider mite infestations increased last week in spite of the cooler temperatures.
Soybean aphid infestations have been observed in LaSalle and Bureau counties, with one report of an insecticide treatment. Sudden death syndrome has been observed in Will County. Additional activities last week include late-season herbicide applications in soybeans.
Spotty showers fell here and there early in the week, with only small areas receiving significant accumulations. Subsoil moisture is still in short supply.
Most corn is at or near the dent stage, but a few producers in the southwest part of the region have begun to chop silage from earlier-planted fields. Western corn rootworm beetle numbers are high in many cornfields. However, rootworm damage in first-year corn has not been found, except in the extreme eastern portions of the region. Heavy flights of second- generation corn borer are still being reported but appear to be tapering off.
Despite shorter canopy heights, soybeans appear to be tolerating the dry weather well. Additional precipitation would likely help to fill pods and improve test weight. Spider mite activity seems to have picked up in the southeastern part of the region. Reports of widespread treatment have not been received.
The Northwest Research Center in Monmouth will hold its annual agronomy research tour on August 20. The tour will begin at 8:00 a.m. and is open to the public. To get to the research farm take U.S. 67 just north of Monmouth and follow the sign to the west.