The window to treat weeds is narrowing.

University of Minnesota Extension crops educator Dave Nicolai says in his state, glyphosate herbicides can be applied through full bloom.

“Or R2. So possibilities, although we’re obviously concerned about weed resistance.”

He tells Brownfield a lot of PPO herbicides like Flexstar GT and Cobra are being sprayed right now.

“But there you’re going to have concerns about making sure we have the proper cutoff in terms of ten-month rotation with corn in Minnesota.

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