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Issue No. 13/June 18, 2004

Armyworms Still on the March
Armyworms have caused heavy defoliation in some northeast Illinois wheat fields. Continue to monitor small grain, corn, and grass pastures. If you are considering insecticide application, remember to consider preharvest intervals!

Reports of Corn Rootworm Larval Injury Continue
Significant root pruning and numerous corn rootworm larvae are still being observed in Illinois cornfields. Concerns about lodging, spread of the variant, and insecticide efficacy continue.

Insect "Briefs"
Short reports and/or web resources are provided regarding Japanese beetles, European corn borer, soybean aphids, and potato leafhoppers.

Preparations for Soybean Rust Continue
Though soybean rust has not yet been reported in the continental U.S., preparations for that possibility are under way in many quarters. Key questions include when the disease might arrive and how much damage it will cause in Illinois if it does. A new protocol for scouting for soybean rust in Illinois is provided.

Soybean Rust: Issues and Facts--A Teleconference on June 29, 2004
In a half-day teleconference, experts will address facts on soybean rust, steps to be taken if it is detected in the continental U.S., and approaches and prospects for management. Contact your local Illinois Extension office for location details.

Wet Soil Conditions Favorable for Phytophthora Rot of Soybean
Favorable conditions for Phytophthora rot of soybean exist in many Illinois areas. This article summarizes key information on symptoms, management, and the major races (and pathotypes) of this pathogen that were identified recently in Illinois.

When the Rain Stops
Observations and recommendations are provided on corn, soybean, wheat, field pea, and grain sorghum in light of the above-normal rainfall throughout Illinois since May 1.

Regional Reports
Reports are provided this issue for northern and southern Illinois.