By Lane Tredway, 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. Plus, Barricade brands are guaranteed to provide control of crabgrass with the GreenTrust^® 365 Barricade Herbicide Guarantee. 

Both products are also labeled to control chickweed, oxalis, Poa annua and spurge, and are non-staining with easy-to-use formulations that offer the maximum convenience. A volume discount is available for both formulations. Barricade may also be formulated on fertilizer for an even more efficient application.

Mode of action

Barricade brands help control susceptible weeds by preventing growth and development of newly germinated weeds.

 

• Weed control is most effective when Barricade 4FL or Barricade 65WG (or Barricade on fertilizer) is activated by at least 0.25 inch of rainfall or irrigation before weed seeds germinate and within 14 days following application
• Crabgrass will germinate when soil temperatures reach approximately 55 F at a 2-inch depth for at least two days in late winter/early spring
• You can track soil temperature with these soil temperature maps and also receive email alerts when the soil temperature reaches this threshold in your area

Barricade + Tenacity

If you have missed your timing for crabgrass germination, Barricade brands can be combined with a post-emergent herbicide like Tenacity^® herbicide. On several turfgrass species, Tenacity + Barricade 4FL or Tenacity + Barricade 65WG will help control:

• Crabgrass
• Many dicot weeds such as dandelion and oxalis, both pre- and post-emergent, widening the window for control of many troublesome weeds
• See the Tenacity label for weed list and tolerant turfgrass species

Barricade + Pennant Magnum

Consider a combination or pre-emergence program of Barricade brands and Pennant Magnum^® herbicide on warm-season turf for control of:

• Goosegrass
• Doveweed
• Yellow nutsedge
• Sprangletop

 

Two modes of action can be an excellent solution to help control more weeds, and a FIFRA 2(ee) label is available for goosegrass control with Pennant Magnum. For examples of how to incorporate Barricade and Pennant Magnum into a pre-emergent program, please see the Goosegrass Control in Warm-Season Turfgrasses brochure. 

Barricade rate conversions

 

Season-long crabgrass and grub control. One application. In northern geographies, the timing of pre-emergent herbicides (from April 1 through May 15) coincides with the application timing of preventive grub control. So, instead of making multiple applications to meet your preventive crabgrass and white grub control needs, upgrade to ONE application of Barricade 4FL or Barricade 65WG herbicide and Acelepryn® insecticide to keep both crabgrass and white grubs in check. You can save time by combining the longest-lasting crabgrass control product with the longest-lasting grub control product for season-long results.

For more information about weed control, contact your local Syngenta territory manager.

© 2025 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^®, GreenTrust^®, Pennant Magnum^®, Tenacity^® and the Syngenta logo are trademarks of a Syngenta Group Company. All other trademarks are the property of their respective third-party owners.