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11 Biggest Herbicide Resistance Threats

The United Soybean Board in collaboration with Universities across the Midwest has published an identification guide to all eleven weed species that have been identified for highest concern to develop or show resistance to herbicides. For more information about herbicide resistance management, visit the Take Action on Weeds website for a comprehensive set of resources.

Pigweeds

• Identification of the weedy pigweeds and waterhemps of Iowa, Iowa State University Extension
• Palmer Amaranth Management in Soybeans, www.takeactiononweeds.com, United Soybean Board
• Waterhemp Management in Soybeans, www.takeactiononweeds.com, United Soybean Board
• 2-page Palmer Amaranth and Waterhemp Identification Guide, www.takeactiononweeds.com, United Soybean Board
• Pigweed/Amaranth ID Video, Ohio State University Weed Science
• Identifying Palmer Amaranth in the Field Video, Purdue University Weed Science
• Palmer Amaranth Seedling Identification VideoPurdue University Weed Science

Giant Ragweed

• Giant Ragweed Management Guide, www.takeactiononweeds.com, United Soybean Board

Common Ragweed

• Common Ragweed, TakeAction, United Soybean Board

Horseweed (Marestail)

• Horseweed Management Guide, www.takeactiononweeds.com, United Soybean Board

Common Lambsquarters

• Common Lambsquarters Management Guide, www.takeactiononweeds.com, United Soybean Board

Common Agricultural Weeds in Wisconsin

• IPM Quick Guide: Troublesome Weeds of Wisconsin, Nutrient and Pest Management program, University of Wisconsin
• WeedID Tool, University of Wisconsin

Common Agricultural Weeds in the Midwest

• Online Weed Identification, University of Illinois
• Weeds of the North Central States, online version, University of Illinois
• Early Spring Weeds of No-Till Production, University of Illinois
• WeedID, online version, University of Missouri
• WeedID App for iphone, University of Missouri
• WeedID App for android devices, University of Missouri
• Practical Weed Science for the Field Scout, University of Missouri
• Ohio Perennial and Biennial Weed Guide, The Ohio State University

Seedling Identification

• Common Weed Seedlings of the North Central States, Michigan State University, print version is available from University of Wisconsin Cooperative Extension