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Hefty Brothers Urge Multiple Modes of Attacking Resistant Weeds

Speaking to a standing-room only crowd at the 2019 Commodity Classic, the Hefty Brothers of AgPhD told farmers that control of resistant weeds is possible, but not by using the techniques they have employed in the past.

“Palmer, pigweed, waterhemp, kochia, marestail, and ragweed . . .all those resistant weeds can be eliminated using a herbicide program that employs multiple modes of action,” explained Brian Hefty. “You need to use pre-emerge, early postemerge, and even a late postemerge application to get 100% control.”

“And don’t settle for what you’ve always done,” added Darren. “Investigate what could work better with your chemical program.” 

This multi-attack approach must be coupled with such management practices as setting a sprayer so that it delivers great coverage, using good quality water (“Water quality is absolutely crucial to chemical performance,” stressed Darren), and adding adjuvants like ammonium sulfate to mixes.

“And we can’t emphasize enough how critical it is to go with a program that uses preemerge herbicides,” says Brian. “The easiest weeds to control are the ones that are still in the ground.”

Other thoughts the brothers shared included the crucial need of having complete weed control in dry areas in the west or during dry years in the Midwest. 

The brothers pointed out that going with multiple applications of herbicides is going to cost more money (between $33 and $50 per acre, depending on the herbicides used). “But consider the yield losses you will suffer if you don’t control these Roundup-resistant weeds,” points out Darren.

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