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No. 03/April 10, 2003

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They're on Their Way: Black Cutworms Arrive in Southern Illinois Traps
Two southern Illinois monitors have reported intense captures of black cutworm males in April. Legwork is required to determine whether black cutworms pose a threat in any given field. We continue to encourage reliance on timely field scouting and application of an insecticide only if damage exceeds published thresholds. Please keep us posted regarding black cutworm activity in your area.

Legs Are the Giveaway: Black Cutworm and Crane Fly Larvae
Larvae of the black cutworm and crane fly are often confused. Photos and text here identify the differences.

A Note Regarding Soybean Aphids
Although soybean aphids caused little concern among Illinois soybean producers in 2002, monitoring will continue in case the potential for dramatic increases in their numbers occurs.

Development of Alfalfa Weevils Proceeds, Despite Colder Temperatures
We have received no confirmed reports of alfalfa weevil activity; we expect larval hatch when about 200 degree-days accumulate. Check alfalfa fields on south-facing slopes or lighter soils first. If temperatures warm up and stay warm, alfalfa weevil activity could be in full swing in a couple of weeks in the southern half of the state.

Mistaken Identity: Alfalfa Weevil or Clover Leaf Weevil?
Clover leaf weevils, which may be lurking in alfalfa fields, are commonly confused with alfalfa weevils at this time of year. Photos and text here identify the differences.

Winter Wheat Disease Situation
Reports indicate that winter-wheat viruses are mild and scattered this season. Symptoms are described for the three most common early-spring virus diseases, along with life cycle, management, and diagnosis.

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

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

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