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Web Editor: Ernst Undesser
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Flooding in both the Midwest and Midsouth in 2019 will cause weed control issues this year and beyond. This won’t be a year to get behind or scrimp on residuals.
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Late-winter herbicide treatments on henbit and white clover may help growers control cotton leafroll dwarf virus (CLRDV), a new culprit that has swept into Southern cotton.
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Destroying weed seed – either in the combine or in a controlled system in the field – takes herbicide resistance management to the next level. In the Midwest, waterhemp will be the driver. Researchers already are looking for the right fit with this Australian-influenced system.
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The stage is set for dense stands of winter annual weeds this spring. Conditions were right last season for abundant weed seed production, plus the relatively mild winter favored heavy emergence. Plenty of fields also laid fallow due to prevented planting and herbicide carryover could be waiting. Combine all that with herbicide resistance and farmers may need extra tools in the box.
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A third company has entered the market with an impact mill that destroys weed seeds before they exit the combine. Until now, these add-on units were made in Australia. For American farmers, the new manufacturer is much closer to home.
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A couple of key herbicides can lose effectiveness when tankmixed with the wrong products. That leads to control failures, especially with grass, and also can trigger resistance across a wider landscape. Stacked traits may only make this worse.
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Impact mills, which destroy weed seeds picked up by a combine, may be doing an even better job than previously thought. A recent University of Illinois study, running an Australian unit, shows that many seeds appear unscathed by the mill but mostly fail to germinate the following spring.
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The marketing rights will transition from Corteva Agriscience to Nufarm in September 2020. Gaining the Goal brands is “a logical expansion of Nufarm’s specialty crop herbicide portfolio,” Nufarm noted in its announcement.
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Can you “heal” plants injured by auxin movement? This webcast summarizes two studies in cotton that address that question and whether susceptible plants can rebound from reduced-rate dicamba and 2,4-D injury at first bloom.
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Any weed that goes to seed will come to haunt you. Taking out resistant populations requires diligence, proper timing and rethinking what works and what doesn’t.
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This year, more training will be required and for a wider range of herbicides. If you haven’t versed yourself on what’s needed, here’s a quick overview. Keep in mind, too, that at least some of this training will become an annual exercise – either in person or on line. Welcome to 2020.
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