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Diverse Weed Populations in Corn Require Diverse Sites of Action

August 12, 2020

A wide array of tough weed species greet visitors to our Brooklyn, WI, Grow More™ Experience site.

Growing conditions at our Brooklyn, WI, Grow More Experience site have been good this season, mirroring those across much of the state. There was a small stretch of cooler-than-normal conditions shortly after spring planting, but warmer weather quickly returned, driving corn growth in our trials through June and into July.

Despite this growth, the first thing you’ll notice when pulling up to the site isn’t the varied array of corn trials, but the sheer diversity of surrounding weed species; everything from foxtail and giant ragweed to lambsquarters, velvetleaf, and of course, waterhemp. It’s a strong reminder that favorable conditions for corn plants are favorable conditions for the toughest weeds, too.

The variety of weeds also underscores the need to use corn herbicides that provide long lasting residual and multiple effective sites of action (SOAs) that are specifically targeted to key weed species. Multiple effective SOAs help ensure quality weed control, which prevents weeds from going to seed and spreading herbicide resistance, while long-lasting residual helps maintain a clean field through canopy and beyond.

Watch as Agronomy Service Representative Nick Groth talks through key takeaways from our bare-ground trials, and check out a few comparison pictures below:

Acuron® corn herbicide applied preemergence at the full labeled rate (3 qt/A). Acuron contains 4 active ingredients and 3 effective SOAs (Groups 5, 15 and 27). Photo taken July 7; 55 days after treatment (DAT).

Acuron® corn herbicide applied preemergence at the full labeled rate (3 qt/A). Acuron contains 4 active ingredients and 3 effective SOAs (Groups 5, 15 and 27). Photo taken July 7; 55 days after treatment (DAT).

Harness® MAX applied preemergence at the full labeled rate (75 fl oz/A). Harness MAX only contains 2 active ingredients and 2 effective SOAs (Groups 15 and 27). Photo taken July 7; 55 days after treatment (DAT).

Harness® MAX applied preemergence at the full labeled rate (75 fl oz/A). Harness MAX only contains 2 active ingredients and 2 effective SOAs (Groups 15 and 27). Photo taken July 7; 55 days after treatment (DAT).

To start and stay clean in 2021, we recommend Acuron corn herbicide. Acuron contains the Syngenta-exclusive active ingredient, bicyclopyrone (BIR), and is the only corn herbicide that delivers 5-15 more bushels an acre when used preemergence at the full labeled rate.* In a 2-pass program, overlapping residual chemistries is key. A foundation rate of Acuron can be followed by the remaining rate post-emergence or an application of Halex® GT plus either atrazine or dicamba for an additional SOA. Calculate the extra revenue potential you could be making with Acuron today.

For future updates from our Brooklyn, WI, Grow More Experience site and other crop management insights relevant to your area, sign up to receive our twice-monthly Know More, Grow More Digest email.

All photos are either the property of Syngenta or are used with permission.

Performance assessments are based upon results or analysis of public information, field observations and/or Syngenta evaluations.

©2020 Syngenta. The trademarks or service marks displayed or otherwise used herein are the property of a Syngenta Group Company. All other trademarks are the property of their respective owners.

*Acuron yield advantage range based on 2016 Syngenta and university trials comparing Acuron to Corvus®, Resicore®, SureStart® II and Verdict® applied preemergence at full label rates.

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