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Part 1: Multiple Modes of Action Control Tough Weeds

November 15, 2016

Kansas and Nebraska: Tough, early-season weeds are the greatest threat to high-yielding corn. In a survey* of top corn growers, the top five weeds they identified as being difficult to control were waterhemp, marestail, Palmer amaranth, giant ragweed and morningglory.

As these weeds, and others, have developed resistance, many current herbicide programs have lost their effectiveness – costing growers both time and money. Starting in June and concluding in August, growers in 10 of the top 11 corn-producing states who used Acuron® or Acuron Flexi corn herbicides, premixes with multiple effective modes of action and active ingredients, shared their results with each herbicide against the toughest weeds. Using a robust pre-emerge herbicide with multiple, effective modes of action to stop weeds before they emerge results in better control, prevents additional weed seed production, and helps manage herbicide resistance.

Here’s a recap of growers’ experiences in Kansas and Nebraska:

June 13, 2016:

Agronomic image of clean corn rows in Kansas

Girard, Kansas: Prior to using Acuron, grower Steve Murphy’s toughest weeds were cocklebur and velvetleaf. His pre-emerge application of Acuron at 2.5 qt/A made on March 24, 2016, showed good residual on both weeds 81 days after treatment.

June 14, 2016:

Agronomic image of clean corn rows in Kansas

Sterling, Kansas: Grower Andy Zwick had populations of glyphosate-resistant marestail in his fields prior to treatment. Acuron applied in two passes, 1.25 qt/A pre-emerge with glyphosate on May 10, 2016, followed by Acuron at 1.25 qt/A when the corn was 12 inches tall.

June 15, 2016:

Agronomic image of clean corn rows in Nebraska

Dorchester, Nebraska: Grower Jayme Dick-Burkey’s field also had a history of glyphosate-resistant marestail. Acuron applied pre-emerge at the full labeled rate with glyphosate.

June 16, 2016:

Agronomic image of clean corn rows in Nebraska

Clatonia, Nebraska: Grower Jeff Miller’s field was covered in a mat of giant ragweed prior to planting. Acuron applied pre-emerge at 2.5 qt/A with 2, 4-D and Banvel® herbicides on April 10, 2016. Photo taken 51 days after treatment. See the before and after photos here.

June 16, 2016:

Agronomic image of clean corn rows in Nebraska

Lindsay, Nebraska: Grower Ken Kurtenbach applied Acuron pre-emerge at the full labeled rate on May 10, 2016. Photo shows control of giant ragweed 37 days after treatment.

June 16, 2016:

Agronomic image of clean corn rows in Nebraska

Lindsay, Nebraska: A planter skip in grower Glenn Beller’s field shows complete control of waterhemp. Acuron applied pre-emerge at the full labeled rate with Touchdown Total® on May 5, 2016. Photo taken 42 days after treatment.

Check the Know More, Grow More Digest for Acuron performance in Northern Illinois and Wisconsin.

Explore our performance map to see how Acuron defeats tough weeds in your area. Did you use Acuron or Acuron Flexi this season? We want to see. Share your photos on social media using #toughweeds.

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*2013 Syngenta market research

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

© 2016 Syngenta. Important: Always read and follow label instructions. Some products may not be registered for sale or use in all states or counties. Please check with your local extension service to ensure registration status. Acuron is a Restricted Use Pesticide. Sale, use and distribution of Acuron Flexi in Nassau and Suffolk counties in the State of New York is prohibited. Acuron®, Touchdown Total®, the Alliance Frame, the Purpose Icon and the Syngenta logo are trademarks of a Syngenta Group Company. Banvel® is a registered trademark of Arysta LifeScience North America, LLC.

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