Kixor Based Products
BASF has introduced three new products based on a broad-spectrum broadleaf weed herbicide, Kixor (saflufenacil). The three new products include: Integrity, a premix of dimethenamid (Outlook) and saflufenacil for field corn and popcorn; Sharpen, which contains just saflufenacil and is labeled for corn, soybeans, and wheat; and Optill, a premix of saflufenacil and imazethapyr (Pursuit) for soybeans.
For soybeans, Sharpen is labeled at the rate of only 1 oz/A, because soybeans have less tolerance compared with corn. The lower rates for soybeans result in reduced residual broadleaf weed control, to the point that Sharpen should not be expected to provide substantial residual broadleaf weed control unless mixed with another residual herbicide.
Sharpen has activity on emerged weeds in addition to preemergence activity, and is apparently being promoted as a replacement for 2,4-D ester in preplant burndown treatments. OSU research shows that while Sharpen applied alone has some foliar activity, it will not adequately control emerged weeds in no-till fields unless mixed with another herbicide that has effective foliar activity (glyphosate, Ignite), and is likely to contribute more activity on annual weeds than on biennials or perennials.
Sharpen does have considerable activity on marestail, and while OSU needs additional data in this area, mixtures of Sharpen with glyphosate or Ignite have effectively controlled marestail. This provides an option for burndown of marestail (and other weeds) in fields where a grower is unable or unwilling to wait 7 days between application and planting. BASF is apparently positioning the combination of Sharpen, glyphosate, and Scepter as a replacement for combinations of glyphosate, 2,4-D ester, and other broadleaf PRE herbicides such as Valor XLT, Sonic, etc. in fields with marestail.
This article was condensed from the November 24, 2009 CORN newsletter at: http://corn.osu.edu/story.php?setissueID=331&storyID=1952
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