Problems associated with common water-hemp have increased rapidly in the past few years for several reasons, including the development of herbicide-resistant biotypes. The 18" x 24" color poster illustrates differences between common waterhemp and redroot pigweed, the two most common Amaranthus species found in Iowa. The poster also shows how resistant biotypes are selected after repeated applications of ALS herbicides.
Single copies of the poster are free, except for the cost of shipping and handling. Additional copies are $1 per poster. To order, contact the ISU Extension Distribution Center, 119 Kooser Drive, ISU, Ames, IA 50011; 515-294-5247. Ask for the poster, Common Waterhemp, IPM-46.
Production of the poster was supported, in part, by the Agribusiness Association of Iowa.
This article originally appeared on page 121 of the IC-476(17) -- July 8, 1996 issue.