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What to Know about Modes of Action

April 8, 2012


The latest marketing twist for herbicides is touting Multiple Modes of Action, but it may not make the product any more effective.
A University of Illinois Extension Weed Scientist says these new mixes, often times, contain herbicides with unique "Modes of Action." But just putting together herbicides with differing "Modes of Action" may do little to either manage the development of resistant weeds, or control those that are already resistant.

Aaron Hager, University of Illinois Extension weed scientist, explains.


Hager says there is a difference between using a premix with multiple modes of action and one with multiple effective modes of action. It means the farmer not only must know and understand how herbicides in the premix work, but that they must also know which weeds are to be treated and, just as importantly, which modes of action those weeds resist.

The challenge, he says is to find and use a premix herbicide with multiple effective modes of action on the weed population in question.



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