Regional Reports

May 26, 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.

East-Central Illinois

· Recent storms have resulted in many reports of sandblasting of corn seedlings across the region.

· Stewart's wilt from heavy flea beetle feeding is still a prevalent concern in the southern part of the region. However, seedling population is still high enough in most cases that producers are not replanting.

· There are reports of other symptoms on the corn that mimic Stewart's damage, including frost injury, possible Flexstar carryover, and sunscald.

· Grape colaspis activity was reported in the northern part of the region, but diagnosis indicated that the cause of the purpling corn was Japanese beetle larvae.

· Tuning fork­type injury was observed in a field that had had an application of Hornet and Atrazine combination. Report from Christian county of Bicep + Princep and crop oil combination causing severe injury.

· Reports of drift injury from corn and soybean herbicide application are numerous, both from producers and rural homeowners.

· The University of Illinois Extension Distance Diagnostic through Digital Imaging System (online Plant Clinic) is up and running in all counties across the state. We can expect a few glitches as we expand from 16 sites to statewide coverage. We urge you to take advantage of the system for your diagnostic needs this season.

Northern Illinois

Seed corn maggot found in corn in JoDaviess County; stand reduced but not enough to warrant a replant.

Cold weather is still a factor in the corn crop remaining a yellow-green color. Warm nights and days would go a long way in improving the visual appearance of the crop.

Bean planting is moving ahead and will hopefully be finished by the Memorial Day weekend, barring any weather delays.

Potato leafhoppers have arrived in northern Illinois and set up shop for a summer of havoc to the alfalfa crop if weather cooperates.

Alfalfa weevil is in all stages, first to fourth instar, cocoon, pupa, and adult. Regrowth needs close monitoring after the crop is removed.

Drying conditions for the hay crop leaves something to be desired. Wind, low humidity, and high temperatures would do a lot for drying. Some hay just beginning to show bloom.

An in-depth insect management workshop is scheduled at the Northern Illinois Agronomy Research Center on July 20, 2000.

An in-depth disease management workshop is scheduled at the Northern Illinois Agronomy Research Center on August 17, 2000. More details on both workshops will follow later.

Southern Illinois

Wheat: Most wheat ripening, Feekes stage 10.5 to 11. Wheat streak mosaic confirmed in Wayne and Pope counties.

Corn: Early planted corn showing five to six true leaves. Some planting

delayed until last 2 weeks due to wet soil. Some armyworm and cutworm

feeding. Southern corn leaf beetle and flea beetle feeding locally heavy. Stewart's wilt showing in some field corn. Japanese beetle grubs present in fields in Monroe County.

Beans: Planting continues with early plantings up.

West-Central Illinois

· Scattered showers spread through most of the region during the last week. Surface moisture levels still remain adequate in most areas. There is some concern about low subsurface moisture levels in the Springfield area.

· Corn is looking fairly good, but there are some reports of pale green­looking fields from dry soil conditions and low nitrogen availability.

· Herbicide injury reports during the last week included Balance, Flexstar, and FulTime on corn. The FulTime injury came as a result of crusting on a light-colored soil from a heavy rain shortly after application, and damage was severe in some parts of the field.

· Growth-regulator herbicide-drift injury complaints have been reported on nearby lawns and trees.

· Some corn replanting is still being done due to wireworm and anhydrous ammonia damage.

· Soybeans look good. Post- emergence herbicide applications will begin soon. Bean leaf beetles are still causing some damage, and there has been a report of a field treated for Mexican bean beetle.

· Wheat looks good with most of it flowering (Feekes growth stage 10.5). There have been some reports of yellowing of the flag leaf because of Septoria.