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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
Email: wgj@purdue.edu

 

Executive Summary
(3 min 48 sec)
 

Full Presentation
(19 min 37 sec)
 

 

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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.

All presentations published on The Plant Management Network reflect individual views of the author/presenter(s) and are not an official position of The Plant Management Network or the author/presenter(s)' affiliated institutions, companies, or organizations. No endorsement of products or companies, institutions, or organizations is intended, nor is criticism implied of those not mentioned. Individuals using agricultural products or any products referenced by The Plant Management Network or its partners, sponsors, or advertisers, should ensure that the intended use complies with current regulations and laws, as well as conforms to the product label.





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