University of Nebraska-Lincoln Extension, Institute of Agriculture and Natural Resources

March 31, 2006

New herbicides and new formulations

In recent years an increasing number of “generic” herbicides have entered the market and the number of new herbicides has declined sharply. However, this year there are two new active ingredients that are applicable in our area: pyraflufen-ethyl and topramezone. There also are a number of name changes for existing active ingredients and several new combinations or ratios of existing active ingredients.

ET (pyraflufen-ethyl) - Nichino America Inc. ET is a cell membrane disrupter and currently registered for use as a preplant burndown treatment for corn, soybean and wheat. It is also registered as a desiccant in cotton and potato.

Gramoxone Inteon (paraquat) - Syngenta. This is a new formulation containing 2 lb/gal paraquat (Gramoxone Max contains 3 lb paraquat/gallon.) and designed for increased safety. The new formulation contains an emetic and, if accidentally ingested, is more slowly absorbed than previous formulations.

Impact (topramezone) - American Vanguard. Impact, like Balance and Callisto, is an HPPD inhibitor. Impact is registered for postemergence broadleaf weed control in corn. Combination with atrazine markedly increases activity.

Olympus Flex (propoxycarbozone [PPO inhibitor] plus mesosulfuron [ALS inhibitor]) -Bayer. Olympus Flex is registered for postemergence grass and broadleaf weed control in winter wheat. It provides greater rotational crop flexibility and better downy brome control with a fall application than Olympus.

Radius – (Define (flufenacet) + Balance (isoxaflutole) ) - Bayer. Radius contains the same active ingredients as Epic and is registered preplant and preemergence in field and silage corn; however, the ratio of flufenacet to isoxaflutole is 8:1 in Epic and 5:1 in Radius. Radius is formulated as a liquid.

Resolve (rimsulfuron) - DuPont. Resolve applied pre or postemergence to corn up to the V6 stage provides control of grasses and certain broadleaf weeds.

Select Max (clethodim) - Valent. A new formulation of Select with greater adjuvant flexibility resulting in increased compatibility with tank mix partners including glyphosate.

Stout (nicosulfuron + thifensulfuron) - DuPont. Stout provides postemergence grass and broadleaf weed control in field corn. Stout can be applied on corn through the V5 stage.

Synchrony XP (chlorimuron + thifensulfuron) - DuPont. Synchrony XP replaces Synchrony STS. Synchrony XP is used for postemergence broadleaf weed control at 0.375 oz/ac in non STS soybean and 0.75 oz/ac in STS soybean.

Alex Martin
Extension Weeds Specialist, Lincoln

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Copyright 2006 by the University of Nebraska Board of Regents. All rights reserved.
Published by University of Nebraska-Lincoln Extension in the Institute of Agriculture and Natural Resources Cooperating with the counties and the U.S. Department of Agriculture.
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