News > Articles > March 2017 > Multiple Modes of Action are Key to Successful Weed Control Applications

Multiple Modes of Action are Key to Successful Weed Control Applications


It’s no secret that Palmer amaranth, water hemp and a number of other invasive species have become quite a challenge to control in and around central Kansas in recent years. Thanks to the resistance these weeds have developed to glyphosate, they can multiply quickly and take a serious toll on your yield potential if left unchecked. That’s why treating your fields with multiple modes of action has become so important.

This year, we’re recommending a post-emergent treatment on corn composed of Laudis®, Sterling Blue®, Roundup PowerMAX® and Warrant® herbicide. While Roundup PowerMAX® still achieves excellent control of many grasses and broadleaf weeds, adding the other tank mix partners can help you get a handle on those tough-to-control glyphosate-resistant invasives. Plus, Laudis® offers residual control, as does Warrant®, which provides a slow release of Acetochlor through its moisture-activated micro-encapsulation technology. This can help prevent weed growth for another 30 days.

We typically prescribe a tank mix of 3 oz. Laudis® herbicide, ½ pt. Sterling Blue® herbicide, 32 oz. of Roundup PowerMAX® herbicide and 3 pt. of Warrant® herbicide with 2.5 gallons of Class Act® NG® adjuvant in a 100 gallons/A carrier solution.

In addition to targeting glyphosate-resistant broadleaf weeds and grasses, this type of formulation allows us to customize the tank-mix partners and rates to address the challenges faced in each of your fields. That’s a problem with premixes, because although they’re convenient, they can be difficult to tweak.

Regardless of which species threaten your newly planted corn crop this spring, application timing is always crucial because treatments need to be made before weeds get too tall and difficult to control.

“Per Sterling Blue® label instructions, this particular formulation needs to be applied before corn reaches V5, or 8 inches in height,” says Kent Nichols, MKC Agronomy Field Sales Manager. “Herbicide treatments should be made on actively growing weeds that are 6 inches or less in height in order to achieve the best control. But obviously smaller weeds are easier to control than large ones, so the earlier you make an application, the sooner you can help improve yield potential.”

This combination of Laudis®, Sterling Blue®, PowerMAX® and Warrant® offers a nice agronomic package when targeting hard-to-control grasses and broadleaf weeds. For more information about integrating this early season herbicide treatment into your crop management plan, please contact your MKC field marketer or nearest MKC location.

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