Marestail, also known as horseweed, is a fast-growing broadleaf weed found in agricultural crops, landscapes, nurseries, greenhouses, roadsides and rights- of- way. Marestail competes with desirable plants, increasing water use and reducing yield. Marestail can cause repeated callbacks for Lawn Care Operators (LCOs) and challenges for growers. The weed can germinate throughout the year and can produce more than 200,000 seeds per plant. Marestail/horseweed resistance to glyphosate and other herbicides is a growing problem.
Valent preemergence herbicides help stop marestail/horseweed before plants emerge for long lasting control, to help fight even glyphosate-resistant marestail.

For alfalfa grape, tree fruit and tree nut growers: prevent marestail (horseweed), pigweeds and more than 90 other tough weeds with long-lasting preemergence and residual protection.
For soybean growers: preemergence control and long-lasting residual control of marestail, pigweeds, waterhemp, rageweed and many other tough weeds; competitive grass performance.
For row crop growers: Valor gives outstanding residual control of marestail, pigweeds, waterhemp, ragweed and many other tough weeds, along with crop rotational flexibility and competitive grass performance.
For soybean farmers: longest residual preemergence control of broadleaves, including marestail, pigweeds, waterhemp, ragweed and many other tough weeds.
For Lawn Care Operators and ornamental growers: suppress marestail (horseweed) and conquer pigweeds, waterhemp, and ragweed with a dry granule for up to eight weeks' preemergence control, longest residual on the market.
For ornamental growers and Lawn Care Operators: long-lasting preemergence prevention of marestail, pigweeds, waterhemp, rageweed and many other tough weeds; tank mix with glyphosate for postemergence knockdown, long residual.