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EPA Approves Liquid Formulation of Fierce MTZ Herbicide

Its maker, Valent U.S.A., says this gives farmers a soybean herbicide with three effective modes of action.

Valent U.S.A. LLC is launching Fierce MTZ herbicide. It's a stand-alone liquid formulation that combines the company's herbicide, Fierce, with metribuzin (the active ingredient in herbicides like Sencor and Lexone). The EPA has approved the soybean product, and the first sales of the product are expected in the 2019 growing season, say company officials. 

Fierce MTZ contains three effective modes of action that include metribuzin, flumioxazin, and pyroxasulfone. Valent officials say the new herbicide mix provides residual control of resistant broadleaf weeds and annual grasses in soybeans, including:

  • Palmer amaranth
  • Common waterhemp
  • Common and giant ragweed
  • Kochia

Fierce MTZ protects fields for up to eight weeks and provides flexibility for crop rotation with limited carryover and rotational restrictions, say Valent officials in a company news release. They say the liquid formulation provides easy mixing and loading.

"With weed control being a key hurdle year after year, we continue to recommend using multiple effective modes of action in weed-management systems," says John Pawlak, Valent product development manager, in a company news release.

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