University of Nebraska—Lincoln Extension GWC9 Biology and Management of Horseweed

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The Glyphosate, Weeds and Crops Series

Biology and Management of Giant Ragweed

GWC 12

Heavy reliance on glyphosate for weed control has resulted in a serious concern for the long-term viability of this weed management tool and the development of weeds resistant to glyphosate.

“Giant ragweed is one of the most common and problematic weeds in corn and soybean production in the eastern Corn Belt,” note the authors of this 16-page guide. “Giant ragweed management is complicated by the weed’s emergence throughout the growing season, its tolerance to control tactics, and its interference with crops. Management is also a challenge because giant ragweed is adapted to an array of environments, including wastelands, roadsides, fencerows, floodplains, and fertile agricultural soils. With the development of herbicide resistance in many giant ragweed populations, the number of effective management options has declined.”

This publication discusses the biological characteristics of giant ragweed and how understanding those characteristics can lead to management practices to minimize yield losses and slow the development of glyphosate-resistant biotypes. It was written by Extension specialists from Purdue, Ohio State, Illinois and Michigan State universities and reviewed by a national team of Extension specialists. It was published by Purdue University as part of the Glyphosate, Weeds and Crops Series.

To order

Biology and Management of Giant Ragweed (GWC12) is available from your local UNL Extension office or from the UNL Extension Publications Warehouse. In addition, a pdf copy is available on the Purdue University Extension Web site.

Extension is a Division of the Institute of Agriculture and Natural Resources at the University of Nebraska–Lincoln cooperating with the Counties and the United States Department of Agriculture.

University of Nebraska–Lincoln Extension educational programs abide with the nondiscrimination policies of the University of Nebraska–Lincoln and the United States Department of Agriculture.