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Weed Competition in Corn
May 2011



By Dr. Bill Johnson

Professor of Weed Science
and Extension Weed Scientist

Purdue University
West Lafayette, IN 47905

Email:wgj@purdue.edu


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Summary:

Weed competition in corn has reemerged as an important management consideration as herbicide use patterns in corn have changed with the adoption of Roundup Ready and Liberty Link hybrids. Prior to adoption of herbicide-resistant hybrids, weed management programs in corn were heavily reliant on use of full rates of atrazine-based preemergence herbicides and selective postemergence herbicides to control escapes. With rapid adoption of herbicide-resistant hybrids, growers are reducing reliance on broadspectrum, preemergence herbicides and increasing reliance on postemergence herbicide such as glyphosate (Roundup) and glufosinate (Ignite). As a result, we are observing more fields that have early-season weed infestations, and hidden yield losses are occurring because postemergence herbicides are applied later than the optimal timing. The goal of this presentation is to discuss various aspects of weed competition in corn, nitrogen accumulation by weeds, and the effect of various management strategies on corn yield potential.


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