The erratic weather pattern in Iowa this spring has presented many corn and soybean farmers with special challenges. "First time in the field for planting was at a premium," recalls Bob Hartzler, an Iowa State University Extension weed management specialist. "When weather even marginally allowed for farmers to get in and plant, planting took understandable precedence over other field activities, including herbicide application and fertilizer placement."
Although the crop was planted in fits and starts, the overall condition of both corn and soybean fields is remarkably good. However there are cases with wild and woolly weed problems in most areas of the state. "And that presents perhaps our biggest concern this early June," notes Hartzler. Here are some quick online resources available from ISU Extension weed science to help answer your questions about weed control.
Extension weed science information:
The main weed science Web page is at:
Among the weed science articles linked are the following:
- Estimating early-season competition losses in corn (posted today):
- Drift management: nozzles or drift retardants:
- Power of the crop canopy:
- Water conditioners for glyphosate applications:
- Dust, tire tracks and glyphosate:
- 2007 Herbicide Guide for Iowa Corn and Soybean Production:
(also available on crop yield test reports CDs we transmitted to partners in December)
- Weed Identification Resources:
If you have specific questions or information needs, contact the ISU Extension crop production specialist in your area of the state, or you can contact ISU Extension weed scientists at Ames at 515-294-1923.