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No. 22/September 05, 2003

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Soybean Aphid Update
As we near the end of August, soybean aphids are still the main cause of concern in many soybean fields. The movement of winged aphids has brought these insects to all areas of the state. With many soybean plants in the later reproductive stages, producers should think twice about insecticide applications.

Soybean Aphid Story: 2003
Soybean aphid densities have been at their highest this year since the insect was first observed in Illinois in 2000. The insect's development and spread across the season is summarized, along with the report of an insecticide efficacy trial.

Fly-Free Date Reminder
Growers preparing to plant wheat for 2004 should remember to plant after the Hessian fly-free date to prevent economic losses. Average dates of seeding wheat for the highest yield are provided by county.

Root Ratings from 2003 Corn Rootworm Control Trials in Illinois
Root-rating data from corn rootworm control trials in three Illinois locations are provided and explained. Damage at Monmouth and Urbana was particularly severe in 2003 in the untreated checks.

White What? White Mold in Illinois Soybean Fields
White mold, also called Sclerotinia stem rot, is appearing in soybean fields in parts of Illinois and can be very destructive. Appropriate cultural and management practices are discussed. Fields should be scouted now to determine whether and where diseases may be damaging the crop.

Stalking the Corn Stalk Rots in Illinois
This summer's conditions may result in increased corn fungal stalk rots in Illinois. Fields should be scouted and early harvest considered if scouting indicates stalk rot may be a significant problem. Disease development, scouting techniques, and management practices are described.

Brown Stem Rot: A Sneaky But Manageable Disease
Brown stem rot can cause yield losses greater than 30%. Its foliar symptoms are almost identical to those caused by sudden death syndrome, but management practices differ. Correct identification is key to effective management.

Wheat Seed Treatments for Fall 2003
Many variables come into play in deciding whether wheat seed treatments pay off. Common seed treatment active ingredients and the fungi they control are detailed.

The Curtain Falls on the 2003 Crop
Answers to four crop-development questions are detailed: Will the rain help increase yields? Any guesses on yields? Is there anything we should watch for? How will the 2003 season be remembered?

Regional Reports
A report is provided this issue for northern Illinois.

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

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