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.
Armyworms have been the focus of attention for many area farmers, predominantly those with grass pasture or hay fields, and for wheat producers. Many fields are starting to show significant levels of natural control. Cornfields have been damaged when caterpillars have moved from original grassy sites to cornfields after the original site was defoliated.
Cutworms, grubs, wireworms, and grape colaspis have all contributed to ragged stands in some fields. This damage was compounded in some locations that were growing slowly because of temperature and moisture conditions.
Field activity was somewhat limited as many areas received rainfall on 2 to 4 days last week. The cool temperatures have caused most of the corn crop to appear slightly chlorotic in color. Soybeans still remain to be planted in northwest Illinois.
Armyworms have reached northern Illinois, as reported in last week's issue of the Bulletin. However, since late last week, reports of insecticide treatments for armyworms are becoming more common. Reports on May 29 from several people indicate that they have observed larvae from 3/4 to 1-1/2 inches long. All producers are urged to scout their fields for possible
Several preemergence grass herbicide injuries have been reported in corn, but these situations should be alleviated once temperatures warm up again.
Moderate temperatures and adequate soil moisture allowed good crop growth this week. Surface soil moisture is good in most locations; however, subsoil is still dry.
Wheat ranges from late dough to beginning to color yellow.
Corn and soybeans have begun to grow rapidly.
A number of forages, wildflowers, and weeds are in bloom, including sweet clover, crown vetch, musk thistle, and wild garlic.
Showers and cool weather were predominant throughout the region last week. Most areas now have adequate moisture for good crop growth at this time.
In general, corn is growing well and getting a good dark green color. However, there are reports of brown-colored corn in Greene County. Respraying is continuing for grass control because some soil-applied herbicides were not effective owing to dry soil conditions at planting. Scouting for first-generation corn borer in earliest-planted fields should begin. Sidedressing N is almost completed. Anhydrous ammonia prices have decreased since May 1.
Soybeans look fairly good. Roundup and other postemergent herbicide applications are beginning. There have been some reports of cutworm damage and replanting because of the pest. Some replanting has occurred because of dry soil conditions. Not many disease problems have been observed.
Armyworm problems in wheat and grass pastures have decreased somewhat; however, they are still abundant in some areas. Scouting for the pest should continue well into June.
Variegated cutworm damage has been reported after first cutting of alfalfa. Scouting for potato leafhopper should begin also.