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Corn+Soybean Digest

Nine Herbicides Join Weed-Control Caravan

Add nine new herbicides to the list of weed control options for your 2000 corn crop.

This year's new-herbicide lineup features two products with new chemistries. The others are new formulations and premix combinations of established herbicides, including four products containing glyphosate, the active ingredient in Roundup.

A few of the following herbicides received EPA registration in time for the 1999 growing season but after our February Corn Weed Control Guide was published. Most, however, are brand new for 2000.

The weed killers with new chemistries are Celebrity Plus and Distinct, both post products from BASF.

Celebrity Plus has an auxin transport inhibitor, a new mode of action, plus plant growth regulator and ALS modes of action. According to Dan McGuire, BASF corn market manager, the product offers the broadest spectrum of grass and broadleaf weed control available in a single-pass post application.

"It effectively knocks out yield-robbing weeds, including woolly cupgrass, waterhemp, velvetleaf, cocklebur, lambsquarters and foxtails," says McGuire. Celebrity Plus will be marketed throughout the upper Corn Belt this year.

Distinct contains diflufenzopyr, which restricts hormone movement through weeds, forcing hormones to accumulate at the growth points. It controls emerged weeds, plus provides residual activity until the crop canopies. It controls many broadleaf weeds, including Canada thistle, waterhemp, velvetleaf, lambsquarters and ALS- and triazine-resistant weeds.

Monsanto is introducing Degree and Degree Xtra, preplant/pre-emerge herbicides containing acetochlor, the active ingredient in Harness and Harness Xtra. In the new products, the acetochlor is encapsulated for temperature activation. Increasing amounts of the chemical are released as the soil temperature rises above 50 degrees.

Company officials say temperature activation extends acetochlor's residual activity and improves crop safety.

Degree is acetochlor alone; Degree Xtra is acetochlor plus atrazine. The atrazine isn't encapsulated, thus is available for contact and residual weed control immediately after application.

Also new from Monsanto is post-applied Ready Master ATZ, a premix of glyphosate and atrazine. The atrazine adds a residual component to glyphosate's burndown activity on tough broadleaf weeds and grasses in Roundup Ready corn.

Under a licensing agreement with Monsanto, NuFarm introduces Debit TMF. A concentrated form of glyphosate, it's available this year primarily for preplant burndown applications on no-till corn. Labeling for over-the-top application on Roundup Ready corn is expected in 2001.

Cheminova's glyphosate brands, Glyfos and Glyfos X-tra, are new for corn this year, too. Glyfos is labeled for burndown applications, while Glyfos X-tra is for post weed control in Roundup Ready hybrids.

Axiom AT, new from Bayer Corp., is a combination of Axiom DF and atrazine herbicides. It can be applied preplant and pre-emergence. In the meantime, the soil-applied Axiom DF has obtained expanded label clearance. Now it can be applied in fall, after Oct. 15, to get a jump on the following year's weed control.

The new use is permitted in medium- and fine-textured soils in Iowa, Minnesota, North Dakota, South Dakota, Wisconsin and parts of Illinois, Nebraska and Ohio.

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