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Issue No. 6/April 30, 2004

Plant Clinic Opening/Changes
The University of Illinois Plant Clinic offers diagnostic testing, as well as reports on pest outbreaks across the season and throughout the country as part of the National Plant Diagnostic Network. The fee schedule for testing is listed along with the mailing address for samples.

Insects Feeding on Early-Emerging Corn
Flea beetle infestations are fairly heavy in some of the earliest-planted corn in Adams and Pike counties. An infestation of southern corn beetles in an Adams County field planted March 23 has also been reported. Details on pest identification, injury symptoms, and treatment options are provided.

Intense Captures of Black Cutworm Moths
Many cooperators monitoring sticky traps in Illinois are beginning to report regular captures of black cutworm moths. Guidelines are given for assessing cutting damage and the need for insecticide application.

Update on the Establishment of Our Corn Rootworm Trials
For probably the first time, corn rootworm experimental trials at Urbana, Monmouth, and DeKalb were all established in April. Results of the efficacy trials will be shared later in the summer.

What Weevils Are in Your Alfalfa?
Tip feeding in alfalfa can be caused by both alfalfa weevils and clover leaf weevils. Take care to differentiate between the two when scouting. Degree-day accumulations and projections for the alfalfa weevil are listed for five Illinois locations.

Thistle Identification and Management
Identification characteristics are specified for five thistles common to Illinois, along with guidelines on management tactics, herbicide applications, and herbicide options.

Planting: Starts and Stops
Though continued slow growth from low temperatures is not ideal, corn stands are likely to be good in most April-planted fields. If soil conditions are good, there is little reason to delay planting soybean; the threat of heavy rainfall after planting is a bigger danger to soybean than low soil temperatures. Wheat in most fields continues to respond well to the cool, relatively dry weather.

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