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Issue No. 16/July 8, 2005

Western Bean Cutworm Adults Found in Northwestern Illinois Counties
Since July 1, western bean cutworm moths have been captured in pheromone traps in eight Illinois counties-Adams, Lee, Mercer, Rock Island, Warren, Whiteside, Will, and Winnebago. Cornfields in those counties need to be scouted.

Rootworm Adults Clipping Silks in Fields with Uneven Silk Emergence
Preventing significant clipping of early-emerging silks may be more valuable than preventing clipping of later-emerging silks, especially in fields suffering from a lack of moisture.

When to Scout for Western Corn Rootworm Adults in Soybeans in 2005
The seemingly rapid onset of western corn rootworm adults emerging from the soil has led to questions on the best timing for using yellow sticky traps to monitor for western corn rootworms in soybean fields.

Keep Scouting for Soybean Aphids
The recent return to more pleasant temperatures could kick-start more rapid development of soybean aphids; be sure to revisit fields where you have already found them this season.

Reports of Spider Mite Infestations Are Still Occurring
If you have not already checked soybean fields in your area for the presence of twospotted spider mites, begin looking.

Corn Enters Critical Stages
The period when relief of water deficiency will bring back high yield potential for corn and soybean in Illinois is starting to run out for both crops.

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