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Part 2: Multiple Modes of Action Control Tough Weeds

November 16, 2016

As mentioned in the previous post, growers in top corn-producing states evaluated the performance of Acuron® and Acuron Flexi corn herbicides in their fields for this series of reports.

In late June, growers in Wisconsin and Northern Illinois shared their results. Giant ragweed was the most problematic weed in the fields there, although weeds like lambsquarters and marestail were also concerns.

While most growers in this area used Acuron, others applied Acuron Flexi to their fields. Tony Bomkamp, a grower from Muscoda, Wisconsin, who used both herbicides on his farm, shared that like Acuron, Acuron Flexi kept the tough weeds out with a single pre-emerge application.

Although pre-emerge is the preferred timing for both Acuron and Acuron Flexi, conditions forced some growers to make post-emergence applications. Acuron has a wide application window, from 28 days pre-plant up to 12-inch corn, and Acuron Flexi can be applied 28 days pre-plant up to 30-inch corn.

Here’s a recap:

June 21, 2016:

Agronomic image of clean corn rows

Baraboo, Wisconsin: Grower Tim Johnson had difficulty controlling giant ragweed and lambsquarters in previous seasons. Photo shows a pre-emerge application of Acuron at 3 qt/A in his field 42 days after treatment.

June 22, 2016

Agronomic image of untreated corn vs. clean rows treated

Muscoda, Wisconsin: Grower Tony Bomkamp applied Acuron and Acuron Flexi in different fields on his farm. Both fields had a history of giant ragweed and lambsquarters pressure prior to treatment. (Left) Acuron applied immediately after planting at 3 qt/A on April 28, 2016. Photo taken 55 days after treatment. (Right) Acuron Flexi applied immediately after planting at 2.25 qt/A on April 22, 2016. Photo taken 61 days after treatment.

June 22, 2016:

Agronomic image of clean corn rows

DeSoto, Wisconsin: Joel and Rhiannon Kunert, a husband-and-wife team, also had fields with giant ragweed prior to treatment. Acuron applied post-emerge at 2.5 qt/A on May 20, 2016. Photo taken 33 days after treatment.

June 23, 2016:

Agronomic image of clean corn rows

Geneseo, Illinois: Acuron applied post-emerge at 2.75 qt/A with Touchdown Total® 14 fl oz and .5 lb atrazine shows control of giant ragweed and marestail in grower Rob DeFauw’s field 37 days after treatment.

Check the Know More, Grow More Digest to read a recap of Acuron performance in Missouri and Southern Illinois.

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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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.