Regional Reports

May 19, 2000
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.

Northern Illinois

In far northern Illinois, first cutting of alfalfa began May 13 and 14. Cutting is further along in the southern part of northern Illinois.

Weevil populations will necessitate scouting alfalfa fields as crop is removed for damage to the regrowth.

Scattered light frost the morning of May 15. Considerable corn shows yellow or silver cast due to cool temperatures the past few days. Thunderstorms moving through the area this past week produced light hail damage in some areas.

Scattered wireworm damage reported, with some replanting taking place.

Bean leaf beetle feeding has been reported in several emerged fields, with some fields nearing threshold for treatment.

Leaf pinhole feeding reported in some 2-leaf corn; no cutworms were found when the plants were dug around.

No-till corn planted into sod in Jo Daviess County was treated for armyworm damage.

Bean planting is progressing with percent planted varying from 50% to 100%, depending on where you are in northern Illinois.

West-Central Illinois

· Most areas received some rainfall recently. Corn is growing well and is approaching 4- to 5-leaf stage.

· Flea beetle, wireworm, and cutworm reports have subsided. There are still reports of southern corn leaf beetle feeding. Grape colaspis damage has been reported also.

· Postemergence herbicide applications in corn are taking place to control both grasses and broadleaf weeds.

· Corn injury has been reported from several herbicides. Axiom damage has been found in Woodford County. Plant symptoms include leafing out under ground and buggy whipping; plants were purple in color and stand was reduced. Flexstar/Reflex (fomesafen) damage has also been noted. Corn damaged by fomesafen will show interveinal chlorosis, resulting in striped leaves. With a 10-month rotation interval for corn, this rotation restriction was not met in some fields. One field with noticeable damage had Reflex applied to double-cropped soybeans on August 2, 1999, and corn was planted on April 23.

· Minor frost injury can also be seen in some areas.

· Soybean planting is complete.

· Seed corn maggot damage has been found on soybean in western Illinois.

· Bean leaf beetle has been a serious problem in some areas with some fields treated with an insecticide. However, very few beetles can be found now, which means the probable end to the first generation in those fields. With high numbers of first generation, there will likely be significant second generation also.

· Potato leafhopper has been found in second-cutting alfalfa but still below threshold levels.

· Wheat is headed out in all areas of the region now, which is ahead of normal, especially in the northern part of the region.