Susceptibility of Spring and Summer Weeds to Herbicide Control in Established Alfalfa / Alfalfa / Agriculture: Pest Management Guidelines / UC Statewide IPM Program (UC IPM)

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Weed Management (Established)

Susceptibility of Spring/Summer Weeds in Established Alfalfa to Herbicide Control
	24DB*	CAR	CLE	DIU	EPT	FLU	GLY+	HAL	HEX	IMA	MET	NOR	PAR*	PEN	SAF	SET	TRI¹
Mode of Action	4	14	1	7	8	14	9	2	5	2	5	12	22	3	14	1	3
ANNUAL WEEDS
Barnyardgrass	N	N	C	P	C	—	C	—	P	C	C	C	P	C	N	C	C
Cupgrass, prairie	N	N	C	P	P	—	C	—	P	N	—	C	P	—	N	C	C
Dodders	N	P	N	N	N	—	C	—	N	P	N	N	P	C	P	N	C
Foxtail, green	N	N	C	C	C	—	C	—	C	C	P	C	—	—	N	C	C
Foxtail, yellow	N	N	C	P	C	—	C	—	C	C	P	C	N	C	N	C	C
Goosefoot, nettleleaf	C	—	N	C	C	C	C	—	C	P	C	C	C	C	N	N	C
Goosegrass	N	N	C	C	C	—	P	—	—	—	P	C	P	C	N	—	C
Junglerice	N	N	C	C	C	—	C	—	C	P	P	C	P	—	N	C	C
Knotweed, prostrate	P	C	N	C	P	C	C	—	C	C	N	P	P	C	C	N	C
Lambsquarters, common	C	C	N	C	C	C	C	N	C	P	P	P	N	C	C	N	P
Nightshades	C	C	N	C	C	C	C	N	C	C	N	C	P	N	C	N	N
Pigweeds	C	C	N	C	C	C	C	P	C	C	C	C	P	C	C	N	C
Stinkgrass	N	N	—	C	C	—	C	—	P	N	P	C	P	—	N	C	C
Thistle, Russian	P	C	N	N	P	—	C	—	P	P	P	C	P	P	C	N	P
Witchgrass	N	N	C	N	C	—	C	—	P	N	C	C	P	—	N	C	C
PERENNIAL WEEDS
Barley, foxtail	N	N	C	P	P	—	C	—	P	N	C	C	P	—	N	C	P
Bermudagrass (established)	N	N	P	N	N	—	C	N	N	N	N	P	N	N	N	P	N
Bermudagrass (seedling)	N	N	C	N	C	—	C	N	P	P	N	C	P	C	N	C	C
Bindweed, field (established)	P	N	N	N	N	N	P	N	N	N	N	N	N	N	N	N	P
Bindweed, field (seedling)	C	C	N	P	N	—	C	—	C	—	N	P	P	P	C	N	P
Dandelion (established)	C	P	N	N	N	—	C	—	P	N	P	N	P	N	P	N	N
Dandelion (seedling)	C	C	N	C	C	—	C	—	C	P	C	N	N	N	C	N	N
Johnsongrass (established)	N	N	C	N	N	—	C	—	N	P	N	C	N	N	N	C	N
Johnsongrass (seedling)	N	N	C	C	C	—	C	—	C	C	N	C	C	C	N	C	C
Nutsedge, yellow	N	N	N	N	P	P	P	C	N	P	P	P	N	N	N	N	N
Plantain, buckhorn (seedling)	C	C	N	C	—	—	C	—	C	—	—	—	C	—	C	N	—
Plantain, buckhorn (established)	P	N	N	N	—	—	P	—	P	N	N	N	N	N	N	N	N
Quackgrass	N	N	—	P	P	—	C	—	P	P	—	—	N	—	N	L	N

= control

= partial control

= no control

—

= no information

NOTE: Weed size and spray coverage affect weed control as will herbicide rate, adjuvant type, spray volume, and environmental conditions.

24DB	= 2,4-DB* (Butyrac)	MOA: 4	IMA	= imazethapyr (Pursuit) (highest rate)	MOA: 2
CAR	=carfentrazone (Shark)	MOA: 14	MET	= metribuzin (Tricor DF)	MOA: 5
CLE	= clethodim (Select Max))	MOA: 1	NOR	= norflurazon (Solicam)	MOA: 12
DIU	= diuron (Karmex)	MOA: 7	PAR	= paraquat* (Gramoxone)	MOA: 22
EPT	= EPTC (Eptam)	MOA: 8	PEN	= pendimethalin (Prowl H2O)	MOA: 3
FLU	= flumioxazin (Chateau)	MOA: 14	SAF	=saflufenacil (Sharpen)	MOA: 14
GLY¹	= glyphosate (Roundup)	MOA: 9	SET	= sethoxydim (Poast)	MOA: 1
HAL	= halosulfuron (Sandea)	MOA: 2	TRI	= trifluralin¹ (Trifluralin)	MOA: 3
HEX	= hexazinone (Velpar)	MOA: 5

* Permit required from county agricultural commissioner for purchase or use.

+ For use in Roundup Ready alfalfa only.

¹Not usually applied at times suitable for controlling winter weeds.

▽ 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.

Text Updated: 04/24