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Issue No. 5/April 23, 2004

Insects Feeding on Early Emerging Corn
We have received reports that both corn flea beetles and southern corn leaf beetles are feeding on corn seedlings in western Illinois. We strongly encourage corn producers and agricultural advisors to check early emerging cornfields for the presence of these insects, as well as other early-season insects and signs of their feeding injury.

How Do Your Records Stack Up?
There are both agronomic and legal reasons for keeping accurate pesticide records. The types of records required for pesticide dealers, commercial applicators, and private applicators are detailed, along with the records required to comply with the federal Worker Protection Standard. A recordkeeping manual is available free from USDA.

An Oversight Regarding Herculex
A detail is corrected regarding the development of Herculex I Insect Protection.

Insect Resistance Management Learning Center
The National Corn Growers Association website has a new tool that provides training on insect resistance management, compliance assurance program, integrated pest management, corn borers, and corn rootworms.

Let's Keep Our Eyes on Armyworms
The capture of some armyworm moths in pheromone traps warrants paying attention in coming weeks. Wheat fields and corn planted into a grass cover crop or into grassy weeds are prime candidates for infestations.

Degree-Day Accumulations and Economic Thresholds for Alfalfa Weevil
Continue to scout for alfalfa weevil larvae to determine whether economically damaging levels are present. Details are provided on determining economic thresholds and suggested insecticide treatments.

Few Cutworms Caught in Traps
Not much news yet on black cutworm moths.

Fusarium Head Blight (Scab) of Wheat, Part 1: The Disease
Fusarium head blight, also called head scab, affected wheat in the southern half of Illinois last year. Disease development, injury symptoms, and options for management are outlined.

Fusarium Head Blight (Scab) of Wheat, Part 2: Folicur Fungicide Available in Illinois
Folicur 3.6F is temporarily approved for use in Illinois to manage fusarium head blight. Guidelines for application are specified, along with information on a forecasting system for predicting the likelihood of FHB in wheat.

Soil-Applied Herbicides
General principles are reviewed for the use and mode of action of soil-applied herbicides.

Dry Soils and Soil-Applied Herbicides
Lack of precipitation may render some preplant and preemergence corn herbicides ineffective. If weeds have begun to emerge before the herbicide has moved into the soil solution, additional management may be warranted. Several postemergence herbicides for grass control in corn are described.

Corn Planting and Soybean Seeding Rate
More than half of Illinois corn was likely planted by April 19. Should remaining fields be reworked if rainfall prevented planting a tilled field? An accurate answer is hard to give. Soybean planting should be finished up by mid-May in most areas if weather patterns hold. Growing conditions in 2003 resulted in variable, but often small, seed size; setting exact seed drop rates remains challenging. Guidelines for choosing seeding rates are presented.

Nitrogen Loss Associated with Surface Application of Urea and Urea-Containing Fertilizers
Recent warm, dry weather probably resulted in partial loss of nitrogen in urea-containing fertilizers; the rate of loss is related to the rate of nitrogen application.

Regional Reports
A report is provided this issue for west-central Illinois.