How to Manage Pests

UC Pest Management Guidelines

Common name		Amount/Acre	R.E.I.+	P.H.I.+
(trade name)			(hours)	(days)
When choosing an herbicide, consider information relating to environmental impact. Not all registered pesticides are listed. Always read label of product being used.
A.	2,4-D AMINE*
	(Amine 4)	0.5–0.95 lb a.i.	48	0
	WSSA MODE OF ACTION GROUP NUMBER1: 4
	COMMENTS: Apply to small broadleaf weeds before bermudagrass seed heads start to form. Follow label instructions and local regulations to avoid damage to adjacent crops.
B.	DICAMBA*
	(Banvel)	0.25–0.5 lb a.i.	24	0
	WSSA MODE OF ACTION GROUP NUMBER1: 4
	COMMENTS: Apply to small broadleaf weeds before bermudagrass seed heads start to form. Follow label instructions and local regulations to avoid damage to adjacent crops.
C.	BROMOXYNIL
	(Buctril)	0.25–0.5 lb a.i.	24	0
	WSSA MODE OF ACTION GROUP NUMBER1: 6
	COMMENTS: Effective for control of winter annual broadleaf weeds if applied when weeds are very small (2- to 4-leaf stage of growth).
D.	TRIFLURALIN
	(Gowan Trifluralin) 10G	20 lb	12	0
	WSSA MODE OF ACTION GROUP NUMBER1: 3
	COMMENTS: Use allowed under a Special Local Needs permit. Can be applied after the fields are burned to kill off old growth for control of several annual weeds, but field trials have not demonstrated worthwhile results.
E.	CARFENTRAZONE-ETHYL
	(Shark) EW	0.008–0.03 lb a.i.	12	0
	WSSA MODE OF ACTION GROUP NUMBER1: 14
	COMMENTS: Effective for control of some winter annual broadleaf weeds if applied when weeds are small (up to 4 inches tall). Control is enhanced with the addition of a nonionic surfactant or crop oil concentrate.
F.	PARAQUAT*
	(Gramoxone Inteon)	Label rates	24	0
	WSSA MODE OF ACTION GROUP NUMBER1: 22
	COMMENTS:
G.	DIQUAT
	(Reward)	Label rates	24	0
	WSSA MODE OF ACTION GROUP NUMBER1: 22
	COMMENTS:
H.	SULFOSULFURON
	(Certainty)	Label rates	12	0
	WSSA MODE OF ACTION GROUP NUMBER1: 2
	COMMENTS: For postemergent control of certain broadleaf weeds, tall fescue, annual bluegrass, sedges, and green kyllinga. Two applications are often needed; takes about 2 weeks to get good control.
I.	TRIFLOXYSULFURON
	(Monument)	Label rates	12	0
	WSSA MODE OF ACTION GROUP NUMBER1: 2
	COMMENTS: For postemergent control of certain broadleaf weeds, tall fescue, annual bluegrass, sedges, and green kyllinga. Two applications are often needed; takes about 2 weeks to get good control.
+	Restricted entry interval (R.E.I.) is the number of hours from treatment until the treated area can be safely entered without protective clothing. Preharvest interval (P.H.I.) is the number of days from treatment to harvest. In some cases the REI exceeds the PHI. The longer of the two intervals is the minimum time that must elapse before harvest.
*	Permit required from county agricultural commissioner for purchase or use.
1	Group numbers are assigned by the Weed Science Society of America (WSSA) according to different modes of action. Although weeds may exhibit multiple resistance across many groups, mode of action numbers are useful in planning mixtures or rotations of herbicides with different modes of action. For more information, see http://www.hracglobal.com.

PUBLICATION

UC IPM Pest Management Guidelines: Bermudagrass Seed Production
UC ANR Publication 3472
Weeds
B. Tickes, University of Arizona Cooperative Extension, Yuma County, AZ
C.A. Wilen, UC IPM Statewide Program, UC Cooperative Extension, San Diego County
Acknowledgment for contributions to Weeds:
C. E. Bell, UC Cooperative Extension, San Diego County

Top of page