Caption: Pana, IL: Clean Acuron® corn herbicide rows (left) vs. rows with a pre-emergence herbicide application of just atrazine and a follow-up application of Halex® GT herbicide to clean up waterhemp pressure. Photo taken July 20, 2017.

A June update from the Pana, IL, Grow More Experience site highlighted the importance of using multiple, effective herbicide modes of action to control waterhemp. Just over a month later, the same plot revealed the importance of residual control. Rows treated with Acuron corn herbicide (left) showed residual weed control through canopy, allowing corn to go into the grain-fill stage without having to compete for nutrients, water and sunlight. Meanwhile, rows that received only a pre-emerge application of atrazine (right) showed stunted growth because of early-season waterhemp pressure.

Caption: Pana, IL: Acuron 3 qt/A and 1 lb/A atrazine 82 days after application. Photo taken July 20, 2017.

Caption: Pana, IL: Atrazine 1 lb/A followed by a post-emergence application of Halex GT 4 pt/A to burndown the waterhemp pressure and provide residual control through harvest. Photo taken July 20, 2017.

Syngenta recommends Acuron or Acuron® Flexi corn herbicide for successful, season-long weed control. Acuron has 3 effective modes of action (groups 5, 15 and 27) and Acuron Flexi has 2 (groups 15 and 27). Both herbicides offer residual weed control and application flexibility, from 28 days pre-plant up to 12” corn for Acuron and 28 days pre-plant up to 30” corn for Acuron Flexi, and work well in one or two-pass systems. A foundation rate of Acuron or Acuron Flexi can be followed by Halex GT (groups 9, 15 and 27) in a two-pass system for an additional mode of action.

Contact your Syngenta representative to visit the Pana, IL, Grow More Experience site in August. You can also check the Know More, Grow More blog throughout the season for periodic updates and event recaps.

Sign up for the Know More, Grow More Digest to receive twice-monthly agronomic email updates pertinent to your area.

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