• Herbicide

Specialized broad-spectrum weed, brush and grass management

Chaparral™ herbicide is the broadest-spectrum weed and brush control product available for rangeland and pastures. It is the simple answer for several significant, unique needs, such as reducing the impact of toxic fescue through seedhead suppression and improving hay quality by removing Pensacola bahiagrass from bermudagrass.

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Better pastures, better performing cattle

Chaparral™ herbicide helps increase overall forage production and utilization. As a fescue toxicosis management tool, Chaparral can help improve forage quality for improved cattle health and performance. 

Better, more convenient buckbrush control

Chaparral delivers a more effective option for controlling buckbrush, other woody plants and broadleaf weeds and offers other features that make it a good choice for the land. With Chaparral, ranchers get a wide window of application on buckbrush; control of other shrubs and weeds often found in the same plant complex, such as absinth wormwood (wormwood sage) and Canada thistle; and a level of residual weed activity not available with other options for buckbrush control.

Take out the toughest weeds

Chaparral controls many broadleaf weeds that other herbicides miss, including pigweed, hoarycress (whitetop), buckbrush, absinth wormwood (wormwood sage), Canada thistle, Missouri goldenrod, houndstongue, wild carrot, giant hogweed and many others.

Controlled weeds

This product delivers effective weed control against the following:

  • Buckbrush
  • Bull thistle
  • Buttercup
  • Cocklebur
  • Common Ragweed
  • Croton
  • Diffuse Knapweed
  • Gumweed
  • Horsenettle
  • Houndstongue
  • Knapweed
  • Musk Thistle
  • Pigweed
  • Plumeless Thistle
  • Russian Knapweed
  • Scotch Thistle
  • Spotted Knapweed
  • Tall Ironweed
  • Western Ironweed
  • Western Ragweed
  • Wild Carrot

Refer to the Product Label for complete product efficacy information.

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State registrations

  • Registered
  • Unregistered

Technical Specifications

  • Active Ingredient

    Potassium salt of 2-pyridine carboxylic acid, 4-amino-3,6-dichloro-; metsulfuron methyl

  • Application Rate

    2 to 3.3 ounces per acre

  • Application Timing

    Chaparral herbicide may be applied postemergence as a broadcast spray or as a spot application to control weeds and brush. Treat when weeds are actively growing and not stressed by drought or other conditions. Increase the herbicide rate within the labeled rate range as the season progresses and plants become more mature.

  • Application Method

    Aerial broadcast. Ground broadcast. Spot treatment. Apply the specified rate of Chaparral as a coarse low-pressure spray. Do not apply this product with mist blower systems that deliver very fine spray droplets. Spray volume should be sufficient to uniformly cover foliage. Increase spray volume to ensure thorough and uniform coverage when target vegetation is tall and/or dense.

Chaparral provides effective control

Data shows that Chaparral controlled horsenettle at rates near 100 percent at the highest labeled rate.

Applications were made in the early summer, and plots were evaluated at three to five weeks after application.

By eliminating weeds and brush from range and pasture land, grass is given more of a chance to thrive, resulting in greater forage production.

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Looking for similar or complementary products? Check out these related options.

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Label precautions apply to forage treated with Chaparral or GrazonNext HL and to manure from animals that have consumed treated forage within the last three days. Consult the label for full details.

™ ® Trademarks of Corteva Agriscience and its affiliated companies. Surmount is a Restricted Use Pesticide. Chaparral and GrazonNext HL are not registered for sale or use in all states. Contact your state pesticide regulatory agency to determine if a product is registered for sale or use in your state. State restrictions on the sale and use of Remedy Ultra apply. Consult the label before purchase or use for full details. Always read and follow label directions. © 2021 Corteva.