See All Corn Webcast Titles, News, and More

Weed Competition in Corn
May 2011

By Dr. Bill Johnson

Professor of Weed Science
and Extension Weed Scientist

Purdue University
West Lafayette, IN 47905

Watch Presentation (38 min 48 sec)

for PC and Android | for Apple devices




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.

Note: These presentations are best viewed at 1024 x 768 resolution. Best audio is achieved with a sound card and audio speakers/earphones. Download Adobe Flash Player if presentation is not viewable.


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.

Privacy Policy   |   Copyright © 2019

Disclaimer   |   Contact Us