Giant Ragweed Management in Roundup Ready Systems

Giant ragweed is one of the most problematic and competitive weeds in corn and soybean in the eastern cornbelt.  Management is complicated because of erratic performance of many soil applied herbicides on this weed, multiple emergence events during the early part of the growing season, and frequent occurrence of herbicide resistant biotypes.  This presentation will discuss the competitive ability of giant ragweed and various management tactics with specific emphasis on biotypes that have developed resistance to ALS herbicides and glyphosate.

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William Johnson Associate Professor of Weed Science in the Department of Botany and Plant Pathology
Purdue University
wgj@purdue.edu
http://www.btny.purdue.edu/weedscience/

Dr. Johnson is an Associate Professor of Weed Science in the Department of Botany and Plant Pathology at Purdue University. He has statewide responsibilities for weed science extension and research in agronomic crops. Dr. Johnson has extensive experience in the biology and management of weeds common to no-till systems and herbicide-resistant weeds and crops. Dr. Johnson is the President Elect of the North Central Weed Science Society (NCWSS) and an active member of the Weed Science Society of America (WSSA) and the American Society of Agronomy (ASA).