What To Do When Herbicide Resistance Is Confirmed

When a weed control failure is confirmed as resistance, immediate action is required to remove any surviving weeds and limit seed production, according to the Herbicide Resistance Acttion Committee website. Action depends on the crop stage and extent of the problem.

Growers should use a combination of the following control techniques:

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Chemical. Applying herbicides to a crop.

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Mechanical. Includes measures such as hand-weeding using cultivation or ploughing to control emerged plants and bury non-germinated seed. It also includes harvest weed seed destruction such as stubble burning and cutting for hay or silage to prevent the weeds from setting seed.

Cultural. Includes altering the crop planting date, row spacing and harvest timing to disrupt the weed cycle. It also includes planting crops that can out-compete weeds, buying certified seed that’s free of weeds and using a diverse crop rotation. Growers should also sanitize farm equipment when moving between fields.

Biological. Includes introducing insects and pathogens that control target weed species and introducing post-harvest grazing of growing weeds.

View more Best Management Practices, including tools to assess the risk of developing herbicide-resistant weeds, at HRACGlobal.com.

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