Common tank mixtures for effective weed control

By Dean Mosdell, Ph.D., technical services manager for Syngenta

Barricade® 4FL and Barricade 65WG herbicides are premier pre-emergent herbicides that deliver low-rate, season-long efficacy against more than 30 of the most troublesome weeds, including crabgrass, oxalis and spurge. Barricade is effective on grass weeds and small-seeded dicot weeds prior to germination. However, tank mixtures are required to control perennial dicots weeds and annual grasses plus dicots post-germination.

Phenoxy and pyridine-based herbicides are the most common products for post-emergent dicot weed control. Post-emergent grass weed control is more difficult because of turfgrass tolerances to herbicides. The most common lawn care mixture is a fertilizer component along with Barricade and a post-emergent dicot herbicide.

  • For pre- and post-emergent crabgrass control - Tenacity® herbicide can be tank mixed with Barricade on most lawns

  • For sedges or grass weed control - Monument® 75 WG or Manuscript® herbicides can be added to the tank on bermudagrass and zoysiagrass lawns

  • For season-long weed, grub, billbug and turf caterpillar control - Timing of a second Barricade application (round 2) will coincide with a grub control application. Acelepryn® insecticide is a long-lasting diamide that can be applied in spring for season-long grub control.
    • Optimal timing:
      • April – June for season-long control of grubs and billbugs
      • June for season-long control of grubs, billbugs and turf caterpillars
    • Other components may include iron and tank rinsate contributing to a complex tank mixture
    • Not only should the components be compatible, but they should also be able to be re-suspended, because convenience may dictate the components are mixed the night before and agitation is restarted the next morning

  • The best way to test for compatibility is a jar test - Mix components in approximate ratios in order of the recommendations on the label (see example below). If components are not compatible, add a compatibility agent. Additionally, let the components rest in the jar for several hours or overnight and see if mixture can be re-suspended. Again, a compatibility agent can help re-suspend the mixture.

Example mixing order:

  1. Water (and rinsate or other wastewater)
  2. Compatibility agent (if needed)
  3. Barricade 65WG, Monument 75WG or other water-dispersible granule formulations (allow product to disperse before adding next product)
  4. Acelepryn
  5. Barricade 4FL, Tenacity or other flowable (FL)/suspension concentrate (SC) formulations
  6. Ester or amine formulations of dicot herbicides, like Manuscript
  7. Urea, iron or other soluble fertilizer, as well as additional water to fill the tank

For information on small packaging sizes of Barricade, Tenacity and Acelepryn, visit GreenCastOnline.com/SmallPacks.

​​​​​​© 2021 Syngenta. Important: Always read and follow label instructions. Some products may not be registered for sale or use in all states or counties and/or may have state-specific use requirements. Please check with your local extension service to ensure registration and proper use. Acelepryn®, Barricade®, GreenCast®, Manuscript®, Monument®, Tenacity® and the Syngenta logo are trademarks of a Syngenta Group Company.

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