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Herbicide Resistance in Giant Ragweed
May 2016

By Bill Johnson, Ph.D.
Professor of Weed Science
Purdue University
Phone: 765-494-4656


Executive Summary
(3 min 48 sec)

Full Presentation
(19 min 37 sec)


for PC, Mac, and
Mobile Devices


for iPhone

for PC, Mac, and
Mobile Devices


for iPhone


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Summary: Giant Ragweed is one of the most problematic and competitive weeds in U.S. soybean and corn production. Its problematic nature is further compounded by a growing trend of evolution of biotypes that are resistant to ALS herbicides, glyphosate, and possibly others in the near future. This presentation will cover some of the basic aspects of the biology of giant ragweed and control measures, specifically for soybean production. It will also cover other unique aspects of giant ragweed such as its ability to serve as an alternative host for stem boring insects and how these insects can influence control with post emergence herbicides.

Responsibility: United Soybean Board (USB) farmer-leaders develop and maintain partnerships with U.S. land grant universities and U.S. ag-focused research organizations such as the Plant Management Network to increase the transfer of checkoff-funded applied and practical production research information to U.S. soybean farmers. USB neither recommends nor discourages the implementation of any advice contained herein, and is not liable for the use or misuse of the information provided.

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