Zero tolerance needed with waterhemp, Palmer amaranth
That next field may not have had waterhemp or Palmer amaranth previously, but one or both will likely show up in those fields the next year.”
Keep Time on Your Side
Some growers might get overwhelmed by the number of factors that could play into the spread and management of these weeds. But Jeff Springsteen, senior product manager, Bayer CropScience, said the best place to start comes down to two words: zero tolerance.
“A zero tolerance policy means that you don’t even give these weeds a chance to go to seed,” Springsteen explained. “You just can’t let these plants go to seed and produce new weeds because once that gets started, it’s very difficult to slow down.”
It’s Time to Resist Resistance
“Growers need to exhibit meticulous stewardship when it comes to their herbicide programs,” said Springsteen. “A lot of growers have the expectation that companies will come out with new chemistries, as they did through the 80s and even into the early 90s. What they don’t realize is that the newest class of herbicides is at least 20 years old.”
Springsteen further explained that contrary to what some growers think, crop protection companies do not have any new modes of action currently in the pipeline.
“We are all looking, but even if a new mode of action was discovered today it would take eight to 10 years before it became commercially available to growers,” Springsteen said. “And that’s a big if. With no new modes of action coming to the market anytime soon, agricultural chemical companies are focusing on how to correctly use existing chemistry and combining multiple modes of action into premixes.”
“That’s exactly why zero tolerance is needed,” explained Bloomberg. “We need to be judicious in our use of the currently available herbicides.”
Since its introduction in 2009, Corvus herbicide typically has been very successful at providing true one-pass control of weeds in corn, Springsteen said. But today, he said, there is no such thing as a herbicide that can provide weed control in a single pass if waterhemp and Palmer amaranth are present.
“Corvus is just as effective as it always has been. It’s just that the weed spectrum has changed–-and is continuing to change–-very quickly,” Springsteen said. “The chemistry has not changed and still provides one-pass weed control in most fields if waterhemp and Palmer amaranth are not present.”
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