The vast majority of canola varieties grown on the Prairies are tolerant to some form of herbicide. Which makes sense, of course, as farmers immediately saw benefits to the technology and adopted the varieties en masse. But, like most things, there are trade-offs to the benefits of herbicide tolerance (HT). One of those is weed resistance potential. The repeated use of any one chemical can and will put selection pressure on whatever pest it’s meant to control, be it a weed, insect or disease. That’s just the way biology works.
What that means is that all farmers should, at some point, think about having a short- and medium-term resistance management plan, in this case as it relates to weed resistance. A part of that plan may mean rotating HT varieties. It may mean always adding a tank-mix in the pre-seed burn-off. It might mean sticking with only one herbicide tolerant crop type in rotation.
RealAgriculture.com spoke with Robert Hornford, senior technical specialist of oilseed and pulse crops for BASF, about the importance of herbicide resistance management not only as it relates to canola varieties, but also in managing resistant wild oat and kochia, as well.
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