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.
Weather has been the big news across the north this past week:
Heavy rains across northern Illinois and southern Wisconsin have led to flooding along many rivers and streams across the north. Once things dry out, replant decisions will be made, and an important point to keep in mind is what herbicide was used for the previous crop and how much time needs to be allowed, if any, for replanting.
Cool, cloudy weather has slowed crop development and led to some problems with post-applied herbicides in corn.
Wet field conditions have delayed post-herbicide applications and in some cases prevented fields from being planted the first time.
With warm, dry weather in the extended forecast, the percentage of first cutting hay made should jump dramatically in the next few days.
Leafhopper populations need to be monitored carefully to prevent unnecessary injury. Fields swept in Stephenson County on June 6 were 3 to 6 inches high and the number of leafhoppers per sweep ranged from 0.05 to 0.3.
Alfalfa weevil larvae are still present and range in size from second to fourth instar. Some feeding can be noticed but not enough to justify treatment in fields checked in Stephenson County on 6/6. Each field needs checking separately as the crop is removed to be sure weevil feeding is not preventing new growth.
Wheat: Ripening in most areas.
Corn: Most corn at the 3- to 5- true leaf stage. Southern corn leaf beetle locally heavy with occasional billbug and cutworm damage. Japanese and white grub causing some damage along with grape colaspis. Southwestern corn borer first flight steady in the central and south-southeastern portion of the southern region. European corn borer first flight low throughout area. Corn earworm first flight tapering off in the southern counties.
Soybeans: Crop progressing well, with some replanting due to soil capping and seedling disease. Limited bean leaf beetle damage. Grasshopper numbers building in roadside ditches and waterways.
Surface moisture appears adequate in most areas.
Wheat fields beginning to turn color.
Reports of corn injury from postemergence herbicide applications.
Reports of growth-regulator symptoms on soybeans.
Fields of Roundup Ready soybeans will need to be treated soon.
Grape colaspis is continuing to cause damage in some areas.