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David Sparks Ph.d Weed Control
by David Sparks Ph.d, click here for bio

Program: Line on Agriculture
Date: June 05, 2019

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One of the biggest obstacles to maximizing yields each year are resistant weeds. Gordon Vail, Technical Product specialist in corn herbicides says a list of the most challenging weeds remains the same.

"The ones that were a real problem this year continue to be waterhemp and Palmer amaranth. What I hear from growers is that it's difficult in controlling them compared to what it used to be say five to seven years ago; and what really seems to be the resonating theme is that if you don't hit the application timing right in the post segment, you're not going to get good control.  Seeing more pre uses so that's really one of the things that they're trying to do to combat that.  The other ones I hear a lot is ragweed particularly giant ragweed.  Very difficult weed.  Morningglory is another one.  Marestail's a big one too in the no-till acres in the eastern Corn Belt.  But those are really the big driver weeds that they're really struggling with and they continue to struggle with."


Vail says producers had the most success with a two-pass control system. "You know if you want to go one-pass and there are a fair number of growers that can actually do one pass, Acuron is probably the best, not probably, it is the best when it comes to one pass weed control. But if you are dealing with difficult weeds like giant ragweed, morningglory, Palmer, waterhemp, you really have to have two passes and it has to be a timely application. So those are really the best practices that I continue to hear working most successfully for farmers."


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