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Understanding the value of residual corn herbicides
Growers can make every acre count with a program approach that benefits from powerful pre- and postemergence residual corn herbicides. This program approach can improve yield potential by reducing weed competition during each stage of the growing cycle and help preserve the effectiveness of herbicide technologies.
Brad Allen, market development specialist, Corteva Agriscience, highlights the importance of setting a strong foundation for weed control throughout the season.
“We encourage farmers to think through their full-season weed control efforts or that season-long program approach,” Allen said. “We want to preserve the efficacy of the herbicide tools we have and working through a program approach with multiple modes of action and layered residuals will help.”
Residual vs. nonresidual
Growers will see benefits from residual herbicides such as long-lasting control that prevents weed germination and reduces early season competition. Using residual products with multiple modes of action (MOA) reduces the pressure on postemergence herbicides. Nonresidual herbicides are best for immediate, postemergence knockdown of existing weeds.
“Residual herbicides help keep weeds from even emerging, and preventing weeds from coming up is easier than controlling them once they’ve emerged,” Allen said.
Resicore® REV herbicide, which can be applied preplant, preemergence or postemergence, provides powerful weed control of more than 75 broadleaf weeds and grasses. Resicore REV herbicide has residual control for up to eight weeks to keep fields cleaner longer and has the flexibility to be used on corn up to 24 inches tall.
“Resicore REV has the flexibility to fit nearly any weed control or agronomic program,” Allen said.
Kyro® herbicide is a novel postemergence corn herbicide that delivers powerful weed control and can be applied to a wide variety of different types of corn — glyphosate-tolerant, non-GMO, seed and popcorn. Kyro fits perfectly in a two-pass program approach and offers enhanced crop safety with encapsulated acetochlor. The encapsulation allows the herbicide to move off leaf surfaces and move directly to the soil, providing an extended residual barrier against tough grasses and broadleaf weeds.
Overlapping residuals
Overlapping residuals in a two-pass system will combat resistant weeds like waterhemp and Palmer amaranth and extend residual control. This approach reduces reliance on a single herbicide and prevents weeds from producing seeds.
“Weeds create competition for young crops,” Allen said. “They fight for water, nutrients and sunlight, so really our goal is to minimize that competition right from the beginning of the season.”
Preventing herbicide resistance
These proven herbicides mitigate resistance by promoting an integrated, multiple MOA approach. The approach combines different herbicide groups in a single pass to ensure effective control. For managing herbicide resistance, growers are advised to develop a three- to five-year weed management plan, rather than relying on single-season fixes.
Resicore REV herbicide allows growers to customize their weed control program with compatible products like atrazine, glyphosate and other key corn herbicides. Kyro herbicide has flexibility as a stand-alone herbicide and as a tank-mix partner with glyphosate, atrazine and other corn herbicides.
Residuals in a program approach
Overlapping residual herbicide applications strengthen the program approach with extended control. To amplify effectiveness, growers should: identify weeds early; apply herbicides when they are small; rotate crops to disrupt weed cycles; and avoid reducing herbicide rates, as this allows for the survival and selection of resistant weeds.
“A preemergence herbicide application with multiple modes of action, including a residual herbicide, is a key piece of the weed control program, because it is the foundation for clean fields throughout the season. A postemergence herbicide application with different modes of action and layering a residual will help the crop reach canopy with minimal weed pressure.”
—Brad Allen
By understanding the value of residual corn herbicides, growers can take advantage of these products to bolster their program approach and, in turn, increase yield potential and weed control efficiency.
Atrazine is a Restricted Use Pesticide. Kyro® and Resicore® REV are not registered for sale or use in all states. Kyro and Resicore REV are not available for sale, distribution or use in Nassau and Suffolk counties in the state of New York. Contact your state pesticide regulatory agency to determine if a product is registered for sale or use in your state. Always read and follow the label directions.
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