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:
- Water (and rinsate or other wastewater)
- Compatibility agent (if needed)
- Barricade 65WG, Monument 75WG or other water-dispersible granule formulations (allow product to disperse before adding next product)
- Barricade 4FL, Tenacity or other flowable (FL)/suspension concentrate (SC) formulations
- Ester or amine formulations of dicot herbicides, like Manuscript
- 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.