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.
In most areas of northern Illinois, more than 90% of the corn acreage has been planted. Far northwest Illinois is the only exception, with 65% of the corn acres planted due to rainfall late last week, ranging from 1 to 3 inches. Soybean planting may be approaching 50% or more in most areas.
Russ Higgins, IPM Extension educator, reported economic damage by alfalfa weevil larvae in a Grundy County alfalfa field over the weekend. Alfalfa weevil larvae have been observed early this week throughout northern Illinois, but most have been below threshold. Populations may change after another week of accumulated degree-days.
Bean leaf beetles have been found in alfalfa fields; therefore, early-planted soybeans should be scouted at emergence.
Dry weather continues in southern Illinois. Approximately 0.2 to 0.5 inch of precipitation was received May 6 and 7, but dust is again flying. Windy conditions over the past week have also accelerated drying and have made spray applications difficult.
Wheat is GS 10.5 (flowering) and relatively disease free. In the few fields that have not been sprayed or tilled, little barley, Hordeum pusillum, is fully headed.
Southern corn leaf beetle pressure is heavy in some cornfields. Japanese beetle larvae have been found feeding on corn roots. Dixon Springs reports heavy true armyworm feeding in grass hay fields. European corn borer moths continue to fly. Significant bird damage to emerging corn has been observed.
Rain was scattered throughout most of the region. Amounts reported ranged from a trace to 1 inch or more. As a result, soybean planting will resume.
Almost all corn is planted. Some is in V4 stage and growing very rapidly. Stands are excellent in most fields.
Corn problems reported include cutworms, grubs, and flea beetles. Fourth-instar cutworm larvae have been found in Logan County, and some corn was replanted in Montgomery County because of white grubs. Postemergence herbicide applications are needed in some fields. Pokeweed and other weeds are developing quickly in no-till fields.
Some soybeans have emerged and already show signs of bean leaf beetle injury. Many fields will emerge very soon.
Wheat is in the heading stages. So far there have been no reports of significant disease problems. Producers should scout their fields periodically for armyworm and other insects.
Alfalfa weevil injury has been severe in some fields. If not treated before harvest, some fields may have to be treated after harvest if it does not green up in a few days. Some producers were able to harvest first cutting without rain.