Issue No. 9/May 25, 2007
Soybean Rust and Other Diseases Discussed at Crop Session
Symptoms and management of major corn and soybean diseases, including soybean rust, will be discussed at a morning workshop at the Northern Illinois Agronomy Research Center on Friday, June 8.
Corn Rootworm Larval Hatch--Accumulated Degree-Days or Calendar Dates?
The relationships of both accumulated degree-days and calendar dates to projected rootworm hatch are discussed.
First Captures of European and Southwestern Corn Borer Moths (and a Comment About Western Bean Cutworms)
Reports are in of the first European corn borer and southwestern corn borer moth captures in Illinois. Many pheromone traps for western bean cutworms will also be monitored again this year.
Activity of Multiple Soil-Inhabiting Insect Pests
Reports are being received of injury or feeding activity by wireworms, white grubs, and grape colaspis larvae.
Armyworms Could Be on the Move in Your Area
Stay alert to the possibility of heavy armyworm larval activity in corn fields.
Illinois Declares Crisis Exemption
The Illinois Department of Agriculture has declared a crisis exemption and is seeking U.S. EPA approval to permit the use of wheat treated with certain herbicides for hay or livestock grazing.
Musings About Postemergence Corn Herbicides
Application guidelines and restrictions on many postemergence corn herbicides are detailed.
Wheat: What Were Those Spots and Stripes?
Wheat growers may be seeing symptoms of two relatively unfamiliar diseases: tan spot and Cephalosporium stripe.
Oat Crown Rust Pathogen Is Currently Active on Buckthorn
Spores of the oat crown rust fungus produced on buckthorn leaves are carried by wind to oat fields, where they can cause infection on susceptible oat varieties.
Nitrogen Loss from Surface Application of Urea-Containing Fertilizer
Lack of rain has raised concern that some of the nitrogen in urea-containing fertilizer has been lost. Whether and how to respond are outlined.
Seeds and Plants in Dry Soil
The potential effects of dry soil and other complicating factors on seed germination and plant growth are described in detail.
Can You Identify This Problem?
An unusual symptom in some corn plants in a field in central Illinois remains unidentified.
Reports are provided this issue for east-central, northern, southern, and west-central Illinois.