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.
Moderate temperatures continue throughout the area, which has been the case for weeks. Rainfall would be welcome, as precipitation as been very spotty during the past 3 weeks.
Insecticide treatments for soybean aphid infestations have increased throughout the region. Insecticide treatments have become more frequent in several areas beginning August 7 and 8. Growers are reminded to check insecticide product labels of the products being used, as preharvest intervals range from 21 days to 45 days. A few reports have been received of soybean sudden death syndrome being observed in Will, Kendall, and LaSalle counties.
Rainfall has been adequate in many places, but more precipitation would be welcome to improve grain fill, especially in the northeast portion of the region.
The corn crop continues to look impressive in most parts of the region, with the exception of a few isolated areas where previous storms caused some substantial wind and hail damage. Significant flights of second-generation European corn borer have been observed in Brown and Schuyler counties, but reports of finding egg masses and larvae are few and far between. Many stalk and ear rots are becoming evident in a number of fields.
Soybean aphid populations continue to grow, particularly in the eastern (Sangamon and Menard counties) and northern (Hancock, Warren, and McDonough counties) part of the region. Producers are encouraged to scout and monitor their fields and manage accordingly. Soybean diseases have yet to become widespread and problematic, but there have been some instances of sudden death syndrome in a number of fields in the central part of the region.