Three Steps to Long-term Weed Control

Three Steps to Clean Fields

Row crop growers today need just three steps to get away from a tough weed.

With just three steps – performed consistently – growers can combat tough weeds and mitigate herbicide resistance. These three steps are essential to the longevity of the field. They can make the difference for the next generation on your farm.

The Bayer Corn Herbicide Portfolio features a variety of weed control solutions. In total, the portfolio includes 11 different active ingredients across six site of action groups. For a flexible and customizable herbicide solution, Waddington recommends the two-pass program of Balance® Flexx followed by Capreno®.

Three steps to clean fields

To maximize efficiency of your herbicide application, mix up sites of action by following these three steps.

1. Identify problem weeds

Knowing the problem weeds in each field is an important first step for weed control. When developing your herbicide program, plan on including sites of action that specifically target those problem weeds.

2. Reference product labels

The Weed Society of America gives numbers to different sites of actions, which are easily found on the product label. Intentionally select multiple and different sites of action based on the weeds you plan to fight. This knowledge is essential for planning different tankmixes and herbicide rotations.

3. Customize your tankmix

Look for herbicide programs that allow for flexibility to incorporate tankmix partners to achieve multiple sites of action. Being able to customize your herbicide program allows you to target problem weeds without repeating the same combinations of sites of action from previous years or applications. Rotation alone does not stop resistance.

Changing up your sites of action is about more than just rotation. In any population of weeds, there will be some that are naturally tolerant to a single site of action. Therefore, long-term weed control is more than just rotating to a new herbicide each year.i

Rotating modes of action at one time was the answer to slowing herbicide resistance development. Today, the Herbicide Resistance Action Committee recommends applying multiple chemicals with more than one effective site of action. Plan on using multiple and different sites of action each time you apply herbicide, both within the same growing season and year-on-year. To minimize escapes, ensure each product targets the same weeds. Don’t start the year with the same sites of action that you ended on the season before.

Mix up your sites of action

Using several effective sites of action in your herbicide program increases the probability of a clean field every season because you’re killing weeds and mitigating herbicide resistance. Using more than one site of action targets weeds in multiple ways, minimizing the possibility of escaped weeds.

“Mixing up your sites of action helps control tough weeds and reduce the potential for resistant species,” said Mark Waddington, selective corn herbicides product development manager at Bayer. “Most importantly, using multiple sites of action prevents weeds from going to seed and adding to the weed seed bank.”

Bayer herbicide solutions

For a flexible and customizable herbicide solution, Waddington recommends the two-pass program of Balance® Flexx followed by Capreno®. This program provides greater flexibility through its wide application window and use of overlapping residual products.

“Combined, Balance Flexx and Capreno give growers the ability to develop strong weed management programs around three unique active ingredients and two effective sites of action,” Waddington said. “To customize this herbicide program and make it your own, flexibly add tankmix partners both pre- and post-emergence.” 

Balance Flexx is a pre-emergence herbicide that provides long-lasting residual control. It optimizes early weed control by killing tough grass and broadleaf weeds and is easily tankmixed with other herbicides, such as those that include long-chain fatty acid inhibitors, fitting into site of action group 15. Recommended tankmix options include atrazine, glyphosate, glufosinate, acetochlor, and S-metolachlor.

Capreno is a postemergence herbicide that delivers foliar and residual control from two sites of action to be tough on grass and broadleaf weeds. It provides long-lasting residual control throughout the season. Recommended tankmix options include glyphosate and glufosinate.

Together, Balance Flexx and Capreno, along with their customizable tankmix partners, can help add effective sites of action to a program by supplying broad-spectrum power for season-long weed management while increasing the program value and giving you management flexibility.

©2018 Bayer CropScience LP, 800 North Lindbergh Blvd. St. Louis, MO 63167. Always read and follow label instructions. Bayer, the Bayer Cross, Balance, and Capreno are trademarks of Bayer. Balance Flexx is a Restricted Use Pesticide. Not all products are registered in all states. For additional product information call toll-free 1-866-99-BAYER (1-866-992-2937) or visit our website at

Work Cited

i Morrison, L. “Always hit weeds with multiple actions.” Corn and Soybean Digest, 2016.
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