New weed resource

Improving the ability to predict emergence timing of weeds in row crops has been a major research emphasis at Iowa State University in recent years. The latest product of this research is a poster, "Weed emergence sequences: Knowledge to guide scouting and control." It depicts the emergence sequence of 16 important weeds of the northern Corn Belt.

This poster is available in 18 X 24-inch and 8.5 X 11-inch formats. Single copies of each poster are free. Multiple copies of the large poster are $1.00, and the smaller poster, $0.25, plus shipping and handling if mailed. The poster can be obtained at ISU Extension Distribution Center, 119 Printing and Publications, ISU, Ames, Iowa 50011, or by calling (515) 294-5247. Ask for IPM 64 (large poster) or IPM 64s (small poster).

Much of the information used to develop the poster was collected by the Weed Management Issue Team sponsored by the Leopold Center for Sustainable Agriculture. Funding to print the poster was obtained through the North Central Integrated Pest Management Program, and was a joint project of ISU, University of Illinois, University of Minnesota, University of Wisconsin, and the USDA's Agricultural Research Service.

ISU has two bulletins that provide additional information on weed seeds and emergence. They are IPM 48 and SA 11. These publications also are available through the ISU Extension Distribution Center.