Keystone® LA

  • Herbicide


  • 5
  • 15

Consistent control

Corn farmers can count on Keystone® LA herbicide for consistent control of both large- and small-seeded broadleaf weeds in areas where atrazine use is restricted or where lower atrazine rates are desired. The dual modes of action provide consistent control of a wide spectrum of grasses and broadleaf weeds, including foxtail, barnyardgrass, crabgrass, waterhemp, lambsquarters, pigweeds and nightshades. Keystone® LA requires only ¼ inch of rain for activation and can be tank-mixed with many pre- and postemergence corn herbicides.

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Excellent control

Requiring only ¼ inch of rain for activation, Keystone® LA herbicide provides excellent control of annual grasses and effective control of small-seeded broadleaf weeds.


Keystone LA can be applied from early preplant to early postemergence and fits conventional, reduced-till and no-till corn production systems.

Controlled weeds

This product delivers effective weed control against the following:

  • Barnyard Grass
  • Cocklebur
  • Cupgrass
  • Foxtail
  • Jimsonweed
  • Kochia
  • Lamb's-quarters
  • Morningglory
  • Nightshade
  • Pigweed
  • Pusley
  • Ragweed
  • Sida
  • Smartweed
  • Velvetleaf
  • Waterhemp
  • Witchgrass

Refer to the Product Label for complete product efficacy information.

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State Registrations

  • Registered
  • Unregistered

Technical Specifications

  • Active Ingredient
    acetochlor; atrazine
  • Herbicide Group
    Acetochlor and atrazine, the active ingredients in this product, are Group 15 and Group 5 herbicides, respectively, based on the mode of action classification system of the Weed Science Society of America. 
  • Approved Use

    A preemergence herbicide for control of annual grasses and broadleaf weeds in field corn, production seed corn, silage corn, sweet corn and popcorn.

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®™Trademarks of Dow AgroSciences, DuPont or Pioneer and their affiliated companies or respective owners. Keystone LA, Keystone LA NXT and Keystone NXT are federally Restricted Use Pesticides. Elevore, Keystone LA NXT, Keystone NXT and SureStart II are not registered for sale or use in all states. Keystone LA NXT, Keystone NXT and SureStart II are not available for sale, distribution or use in Nassau and Suffolk counties in the state of New York. Contact your state pesticide regulatory agency to determine if a product is registered for sale or use in your state. Always read and follow label directions.