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.
Closer-to-normal June temperatures arrived over the weekend, and the corn crop has certainly responded throughout the region. The main activities during the week included finishing corn postemergence herbicide application and cultivating corn. Soybean postemergence herbicide application is also in full swing. Wheat is beginning to turn and oats are beginning to head.
Few reports of insect problems have been made throughout the region; however, European corn borer moths have become more visible over the past week. Jim Morrison, crop systems Extension educator, reports several Stephenson County alfalfa fields with potato leafhopper (PLH) counts as follows: 6-inch alfalfa with 0.2 PLH/sweep and 12-inch alfalfa with 0.25 PLH/sweep, which is below treatment threshold at this time. Jim Donnelly, Ag View FS, reported grape colaspis root feeding (five larvae/plant) in a Bureau County field. Also, Jim reported finding rootworm larvae in several cornfields, with numbers ranging from one to five larvae per plant.
Late last week, a line of storms split the west-central region, with areas from Macomb to the south receiving anywhere from 1 to 3 inches of rainfall. To the north of Macomb, less rainfall was received (0.2 to 0.6 in.), and producers were not kept out of the field for very long. Planting is for the most part done in nearly all portions of the region. The main activities this past week included postemergence application of herbicides on soybeans, sidedressing nitrogen on corn, mowing roadsides, and completing harvesting of the first cutting of grass hay. Irrigators in Henderson County have begun fertigation of corn.
Most of the corn is V5 to V10, with some of the earliest-planted fields as far along as V13. Growth of early-planted corn has finally kicked into high gear. Buggy-whipped corn was a common sight in a number of fields earlier this spring and can be mainly attributed to cool weather. As early-planted corn begins to grow out of this condition, you can see many scattered cornfields with upper leaves that are lighter and more translucent in color. European corn borer larvae in the first and second instar have been found in a number of fields, and whorl feeding is evident in many areas. More reports of injury due to grape colaspis and true white grub feeding in corn have also been received. Soybeans vary in development, from emerging to V4, and soybean cyst nematodes can easily be found feeding on roots of soybeans.
Wheat scab is evident in the area and some other diseases, including Septoria leaf blotch/spot, appear as if they might impact yields.
The Western Illinois University Department of Agriculture, in cooperation with University of Illinois Extension, is sponsoring a free Herbicide Field Plot Tour on Thursday, June 26, at 1:00 p.m. at the WIU Agronomy Field Laboratory (immediately north of the WIU Golf Course in Macomb). Fourteen corn experiments and seven soybean experiments will be shown in no-till, strip-till, and mulch-till. Other topics include PPO-resistant waterhemp, triazine-resistant lambsquarters, glyphosate-resistant marestail, strategies to protect the effectiveness of glyphosate, giant ragweed biology and control, pokeweed control, and chickweed biology and control.
No registration is required; for more information, call Sean Evans (309-836-3366) or Dr. Gordon Roskamp (309-298-1569).