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Issue No. 20/August 5, 2005

Spider Mite Problems Intensify in Northern Illinois
It is important to note the significant decrease in twospotted spider mites in plots that have not been treated this summer. The reason is uncertain. The explanation for increased numbers of mites in plots that have been treated twice with the same product is also unclear.

Late-Season Root Protection of YieldGard Hybrids: Evaluating Performance
The performance of YieldGard hybrids has looked exceptional in many fields this summer, but late-season pruning is again greater than expected in some experiments.

Soybean Aphids in Illinois: An Update
Though a widespread problem with soybean aphids this year is by now improbable, it is too early to stop scouting. Remember to make any control decisions on a field-by-field basis.

Continued Concerns About Control of Twospotted Spider Mites
Densities of twospotted spider mites have crashed in two untreated experimental plots. Producers who have experienced limited results after two applications of miticide may want to wait before applying a third time.

Don't Forget About Late-Summer Moths in Corn
Resources and guidelines regarding European corn borer, corn earworm, and western bean cutworm moths are discussed.

Impact of Late-Season Glyphosate Applications on Weed Seeds
Do late-season applications of glyphosate actually reduce the amount of weed seed produced? Success depends to a great extent on timing.

Weed Control in Wheat Stubble Fields
Farmers should not allow weeds in wheat stubble fields to reach maturity and produce seed. Options for control are outlined.

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