Fall is a good time to look for weed resistance

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Fall is a good time to look for weed resistance

Herbicide-resistant weeds may make their presence known this fall.

Corteva Agriscience Enlist field specialist Mark Mongen says weed resistance can develop quickly or slowly, depending on the weed species and other factors.

“If conditions are good and you’ve made timely herbicide applications and you’re still not getting control, that could be a sign of resistance.”

He tells Brownfield another possible sign is if a dead weed is a short distance from a surviving weed of the same size and species.

“Controlled weeds indicate the herbicide is working (so) be sure to survey fields a few weeks after application to check for surviving weeds. I mean, that’s the key.”

Mongen says if surviving weeds are isolated in field sites, resistance could be present.