Set the stage for pre-emergent weed control in warm-season turf
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September 22, 2026
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By Ron Townsend, M.S., technical services manager for SyngentaMaintaining clean, uniform turf through the growing season often depends on what happens before weeds emerge.
Princep® Liquid herbicide, which will become
available in October 2026, is a proven pre-emergent herbicide option that can play an important role in a season-long weed management plan—particularly where superintendents need broad-spectrum and dependable residual control as part of an integrated program.
Princep Liquid contains
simazine, a photosystem II–inhibiting herbicide (Group 5) that helps prevent susceptible weeds from establishing by controlling germinating seedlings. Used correctly and in rotation with other herbicide groups, it can help reduce early-season weed pressure and support cleaner playing surfaces with fewer in-season rescue treatments.
Expand control and strengthen your program- Princep Liquid can be used to control a wide variety of broadleaf and grassy weeds in warm-season turf.
- Pre-emergent control includes annual bluegrass, burclover, lawn burweed, common and mouse-ear chickweed, henbit and more.
- Princep Liquid is included in the GreenTrust® 365 Poa annua Guarantee Program for Non-overseeded Fairways.
- Features proven application recommendations and performance guarantees for protecting your bermudagrass and zoysiagrass fairways from Poa annua.
- Tank-mix with Barricade® 4FL herbicide to broaden the spectrum of control on summer annual or winter annual weeds.
- For annual bluegrass control, tank-mix applications of Barricade 4L + Princep Liquid + Monument® 75WG herbicide provide early post-emergent control and resistance management.
| Exceed standard levels of goosegrass control |
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| Average of 12 trials in Florida, 2014. |
Princep Liquid can be applied to semi-dormant turf without delaying green-up. On dormant bermudagrass, mixtures of
Reward® landscape and aquatic herbicide and Princep Liquid provide excellent control of
Poa annua and other winter annuals. To learn more about how to fit Princep Liquid into an agronomic program, visit
GreenCastOnline.com/Programs.
All photos are either the property of Syngenta or are used with permission.
Performance assessments are based upon results or analysis of public information, field observations and/or internal Syngenta evaluations. Trial reflects treatment rates commonly recommended in the marketplace.
© 2026 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. Barricade®, GreenCast®, GreenTrust®, Monument®, Pennant Magnum®, Princep®, Reward®, Tenacity® and the Syngenta logo are trademarks of a Syngenta Group Company. All other trademarks are the property of their respective third-party owners.