Use a Pre-emergence Residual Herbicide for Better ROI
New research from three Midwestern universities for a glyphosate-tolerant corn timing study conducted in 2007 and 2008 underscores the value of early-season weed control and the use of a pre-emergence residual herbicide. The study looked at giant ragweed and foxtail, showing that controlling weeds early with a pre-emergence residual herbicide resulted in the highest yields versus post-only applications of glyphosate.
This study shows that a pre-emergence residual herbicide out-yielded the use of no pre-emergence every time. More importantly, when comparing timings, the above graph demonstrates the loss in yield that can result in waiting just two weeks. The yield difference between one shot of glyphosate at the late timing only and a pre-emergence application early in addition to glyphosate adds up to nearly 20 bushels per acre. In addition, longer residual offers an extended window for an application of glyphosate if needed.
For weeds like giant ragweed that have already been confirmed resistant to glyphosate herbicides, controlling them early provides the best probability to deter resistance from developing while saving yield potential.
Lumax® and Lexar® herbicides, both Resistance FighterTM brands, help provide the best opportunity for one-pass weed control when used pre-emergence at a full rate. At a minimum, these herbicides help to provide a wider window of application for glyphosate.
For additional information about this research check out, Latest university data continues to confirm the importance of early-season weed control in corn.
How have you seen early-season weeds impact your yield? How have residual herbicides impacted yields?
Important: Always read and follow label instructions before buying or using these products. Lexar and Lumax are Restricted Use Pesticides. Lexar®, Lumax® and Resistance FighterTM are trademarks of a Syngenta Group Company.