Protect Corn at Its Most Vulnerable Stage

protect corn

Herbicide applications that provide control of emerged weeds and prevention of new weeds protect corn at its most vulnerable stage, just after emergence.

Early in the growing season, shortly after emergence, corn plants are just beginning to put down their roots. At this stage, their demand for nutrients, water and light is small, so resources are plentiful and small weeds are noncompetitive. From a distance, corn plant development appears to be off to a great start, but these young plants are at their most vulnerable. Though not directly competing with weeds for resources at this stage, corn can sense the presence of and have noncompetitive interactions with even the smallest of weeds, negatively affecting corn growth, development and yield potential.

Learn how the Bayer Corn Herbicide Portfolio can help protect against tough weeds

Corn plants are most sensitive to nearby weeds during the first week of postemergence, even when they are only a few inches tall, and can detect changes in light quality when sunlight is reflected off nearby weeds.  As soon as a corn plant detects the presence of a weed, it will engage in a shade avoidance response, reallocating resources to elongating and growing taller in order to overshadow nearby weeds, neglecting whole plant development. The roots often suffer the most in this scenario, as they are smaller and poorly developed. The poor nutrient uptake that results can lead to poor grain fill, lower quality and reduced yields.

“Corn yields can be affected as soon as weeds emerge from the ground,” said Frank Rittemann, selective corn herbicides product manager at Bayer. “Early season weed control is necessary to protect corn from both competitive and noncompetitive interactions at its most vulnerable stage.”

Bayer solutions for weed management 

Protect your corn when it is most vulnerable by controlling weeds before they go to seed. Rittemann recommends using Corvus® herbicide tankmixed with Harness® Xtra herbicide, followed by DiFlexx® DUO herbicide tankmixed with  Roundup PowerMAX® herbicide.

Corvus, tankmixed with Harness Xtra, provides four distinct sites of action for control of weeds pre-emergence.  With as little as a half-inch of rain, Corvus reactivates to help wipe out tough, resistant weeds. “Corvus kills weeds before they are out of the ground and takes out any weeds that have already emerged,” said Rittemann. “This minimizes the weeds that emerge with the corn plants and gives them an early start on acquiring nutrients before they engage in any shade avoidance response due to weeds.”

DiFlexx DUO, tankmixed with Roundup PowerMAX, helps takes down tough-to-control, resistant weeds postemergence. “With multiple, powerful and effective sites of action, this postemergence application works best if applied soon after emergence to take weeds out at three inches or less,” Rittemann said. 

When used as part of a two-pass herbicide program, Corvus, tankmixed with Harness Xtra, and DiFlexx Duo, tankmixed with Roundup PowerMAX, help to effectively take out and control tough weeds to protect corn at its most vulnerable.  

ALWAYS READ AND FOLLOW PESTICIDE LABEL DIRECTIONS. Corvus® and Harness® Xtra are restricted use pesticides. Not all products are registered in all states and may be subject to use restrictions. The distribution, sale, or use of an unregistered pesticide is a violation of federal and/or state law and is strictly prohibited. Check with your local dealer or representative for the product registration status in your state. Bayer, the Bayer Cross, Corvus, DiFlexx, Harness and Roundup PowerMAX are registered trademarks of Bayer Group. For additional product information call toll-free 1-866-99-BAYER (1-866-992-2937) or visit our website at Bayer CropScience LP, 800 North Lindbergh Boulevard, St. Louis, MO 63167. ©2020 Bayer Group. All rights reserved.

Work Cited

i Hartzler, B. “Protect Your Corn Yields from Weeds.” Iowa State University Extension and Outreach: Integrated Crop Management News, 2010.

Copyright © Bayer CropScience