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Issue No. 7/May 6, 2005

Some Corn Stands Struggle
If early-planted fields were checked just after the frost last week and the growing point was alive but most or all of the leaf tissue was dead, the assumption that these plants would grow back might not be accurate. Such fields need to be revisited immediately and a count taken of plants that are adding new, green leaf area.

Soybean Alatoid Nymphs Reported on Buckthorn Plants on Purdue Campus
Winged soybean aphids will soon begin a search for soybean plants; many may die trying, while others may return to buckthorn and begin new generations. A multistate soybean aphid monitoring project begins this summer to help illuminate population dynamics of the pest.

Soil Insecticide Use and Replant Decisions: What Do the Labels Say?
In fields where a soil insecticide has been applied to prevent corn rootworm larval damage, producers need to be aware of any prohibitions against second applications. Be sure to consult product labels.

Expression of Corn Rootworm Transgenic Cry3Bb1 Protein Reported to Diminish from V4 to V9 Stages in Five Hybrids
Research continues to reveal how transgenic corn rootworm hybrids perform under various environmental conditions and at various growth stages.

Update on Black Cutworm Trap Catches
Though black cutworm moth activity has been unusually low this year, the risk of black cutworm injury continues. Don't neglect scouting.

Section 18 Label Granted for the Fungicide Folicur to Control Fusarium Head Blight (Scab) on Wheat in Illinois in 2005
Details are outlined on the newly approved use of Folicur to manage scab on wheat in Illinois.

Understanding and Managing Fusarium Head Blight (Scab) of Wheat
Wheat scab is challenging to manage. Disease prevention and management tactics are discussed along with guidelines for using Folicur foliar fungicide.

Second Update for 2005 on Management of Soybean Rust with Fungicides in Illinois
The most current of the frequently changing information on use of fungicides for soybean rust management in Illinois is detailed.

Delayed Applications of Soil- Applied Corn Herbicides
Can a soil-applied herbicide be applied after the crop has emerged? For many products, yes, but additional management procedures may be needed.

Postemergence Corn Herbicides--Considerations to Keep in Mind
Factors that influence absorption of postemergence herbicides, application restrictions with respect to corn size, and tank-mix restrictions are discussed.

The Good, the Bad, and the Unsightly
The implications of the recent "refrigerated conditions" for crop growing are detailed.

All OK Underground?
Some reports of disoriented growth among corn seedlings have been received; potential reasons are discussed.

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