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No. 07/May 08, 2003

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In issue 6, Baythroid 2 was omitted as a rescue treatment for black cutworm.

Time for Alfalfa Watch
Alfalfa Watch uses the PEAQ estimation method to help producers monitor quality and plant growth. At the project's Web site you can view reports twice weekly as well as learn to calculate PEAQ, view PEAQ values statewide, and enter and track personal PEAQ values.

Reports of Damage Caused by White Grubs and Wireworms
Symptoms of injury caused by subterranean insects are beginning to appear. Wireworm problems seem to be more numerous than white grub problems at present. There are no rescue treatments for either pest after damage is discovered; we are testing the efficacy of several products that we applied for Japanese beetle grub control this spring.

Southern Corn Leaf Beetles Are Active in Western Illinois
Reports of injury by the southern corn leaf beetle in portions of Illinois are growing. This article reviews pest identification, injury to corn seedlings, life cycle, and control.

More on Black Cutworms
As corn begins to emerge in your fields, remember to scout for cutworms! Dingy, variegated, and claybacked cutworms can be mistaken for black cutworm. This article tells how to distinguish them.

Reports of Flea Beetles Continue
More reports of corn flea beetle feeding on seedling corn have come in; anecdotal evidence on the effectiveness of seed treatments varies.

Update on Heat Unit Accumulations for Corn Rootworm Larval Hatch
Though there is considerable variation from year to year regarding the onset of corn rootworm larval hatch, soil heat unit accumulations at the 4-inch level suggest that this year's hatch may be very similar to last year's (late May).

First Captures of European Corn Borer Adults in Southern Illinois
Although it's too early to start scouting for European corn borers in Illinois, it's worth noting the presence of adults to prepare for scouting in the near future.

Stalk Borers Could Attack Corn in Southern Illinois Soon
Cornfields in southern Illinois could soon be at risk for stalk borers; farmers in central and northern Illinois probably won't see them for a couple of weeks.

Alfalfa Weevil Update
Nearly all of Illinois has accumulated enough degree-days that scouting for alfalfa weevil is warranted. Several natural control agents may help keep populations in check and should be looked for as well.

What's in a Name?
Trade names may be memorable but misleading. Chemical names are unique but often hard to remember. Knowing common names, which pinpoint active ingredients, can be key to evaluating herbicide premixes, identifying generic products, and accurately rotating herbicides.

Why Has Horseweed (Marestail) Become a Concern?
Horseweed has earned a spot on the list of the six broadleaf weeds most commonly found in Illinois soybean fields. This article details the plant's biology, challenges with management, and concerns about herbicide resistance.

Missed the Preemergence Application Window in Corn?
Growers who have planted corn but couldn't apply preemergence herbicide before the corn emerged have two choices: use a delayed application, or switch to a postemergence strategy. This article outlines considerations for the two approaches.

Crop Recovery from Weather Events
The influences of storms, standing water, and hail on planting dates, seedling development, and decisions about replanting are described.

Regional Reports
Reports are provided this issue for northern and west-central Illinois.

2003 Agronomy Field Days
Dates and locations of field days for 2003 are provided.

The Pest Management and Crop Development Bulletin
Executive Editor: Kevin Steffey, Extension Entomologist

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