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 Horseweed

GWC 9

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

Glyphosate-resistant horseweed was first reported in 2000 and has now been reported in 10 states. The authors note that "Common to all known cases of glyphosate-resistant horseweed is the frequent use of glyphosate for control of all weeds, little or no use of alternative herbicides that control horseweed, and long-term no-tillage crop production practices."

This publication addresses the biological characteristics of horseweed that make it particularly troublesome to control in agronomic crops and provides management strategies to control herbicide-resistant horseweed and hopefully slow the spread of glyhosate resistance. It was written by Extension specialists from Ohio State and Purdue universities and the University of Illinois and reviewed by a national team of Extension specialists. It was published by Purdue University as part of The Glyphosate, Weeds and Crops Series.

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Biology and Management of Horseweed (GWC9) is available in a pdf copy 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.

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