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2012 herbicide update

Gil Gullickson 04/04/2012 @ 9:32am Crops Technology Editor for Successful Farming magazine/Agriculture.com

Chemical companies have launched several premixes, formulations, and rate changes for corn and soybean herbicides in 2012. Here are some that you will see.

● Liberty single application rates on LibertyLink soybeans rise to 36 ounces per acre. A subsequent 29-ounce-per-acre rate of Liberty is allowed for the second application.

“Liberty herbicide needs to be used differently than glyphosate,” reminds Mike Owen, Iowa State University Extension weed specialist. It's important to apply first applications early, when young weeds are 3 to 4 inches high.

● Flexstar GT 3.5 features a new formulation of fomesafen and glyphosate. This premix contains 5.88% fomesafen and 22.4% glyphosate. “It will do a good job on glyphosate-resistant weeds if you get them small,” says Owen.

● Warrant, an encapsulated formulation of acetochlor, is now labeled for postemergence application to field corn. Applicators may apply Warrant to corn up to 30 inches high in either broadcast or as a directed treatment (drop nozzles) to minimize crop interference of spray coverage. Warrant should be applied prior to weed emergence and will provide residual control of annual grasses and some small-seeded annual broadleaf weeds, says Owen.

● Basis Blend is a new premix of rimsulfuron (20%) and thifensulfron (10%) that is suggested to be a better formulation for handling, mixing, and cleanout than a Basis 75% DF, says Owen. It can be applied any time after harvest, but prior to ground freeze-up.

● Armezon herbicide from BASF contains topramezone, the same active ingredient as in Impact herbicide. It is aimed at postemergence applications in corn for management of problem weeds like common lambsquarters, waterhemp, giant foxtail, and crabgrass.

● OpTill Pro herbicide is one of the Kixor stable of herbicides. This premix features three modes of action (Kixor's salflufenacil's active ingredient with the active ingredients in BASF's Pursuit and Outlook herbicides) for both burndown and residual control.

● Zemax herbicide from Syngenta contains the active ingredients of Callisto (mesotrione) and Dual II Magnum (S-metolachlor). The double-mode-of-action herbicide can be applied from 14 days early preplant up to 30-inch corn. Company officials say it is more compatible with sulfur-containing nitrogen fertilizers.

● Parallel Plus is a new formulation containing metolachlor and atrazine from MANA for corn and grain sorghum. MANA officials say it will require less time and manual attention to handling and mixing. Parallel Plus also features Benoxacor, a crop safener company officials say improves crop safety.

● Valor, a preemergence herbicide from Valor, has a modification of its label that describes planting corn seven days after application in no-till and minimum tillage.

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