Susceptibility of Winter Weeds to Herbicide Control / Small Grains / Agriculture: Pest Management Guidelines / UC Statewide IPM Program (UC IPM)

Weeds Pages

	BRO	CAR	CHS	CLO	DIC*	FEN	FLM	FLR	GLY	IMZ	MCA*	MES	PAR*	PEN	PIN	PYO	PYR	SAF	TRB	TRI	24D*
Mode of Action¹	6	14	2	4	4	1	14	4	9	2	4	2	22	3	1	2	14	14	2	3	4
ANNUAL WEEDS
barley, hare	N	N	C	N	N	N	P	N	N	C	N	C	P/C⁺	N	—	—	N	—	—	—	N
bluegrass, annual	N	N	C	N	N	N	C	N	N²	—	N	C	P/C⁺	C	—	—	N	—	—	C	N
brome, ripgut	N	N	C	N	N	N	P	N	N	—	N	P	N	P	—	C	N	—	—	C	N
burclover, California	N	P	C	C	C	N	P	—	C	—	P	N	P	—	N	—	—	—	—	—	C
canarygrass, hood	N	N	C	N	N	C	—	N	N	—	N	C	N	C	C	P	N	—	—	C	N
canarygrass, littleseed	N	N	C	N	N	C²	—	N	N	C	N	C	N	C	C	P	N	—	—	C	N
chamomile, mayweed	C	—	C	—	C	N	—	C	C	—	N	P	C	N	N	—	—	—	C⁺	—	N
chickweed, common	N	P	C	—	P	N	C	C	C	C	N	C²	C	P	N	C²	C	P	C²	C	N
fiddleneck, coast	C	C	C	—	P	N	—	C	C	P	P	P	P	C	N	C	N	—	C	C	P
filarees	N	P	—	P	C	N	C	—	P	P	P	—	C	P	N	—	—	P	P	—	C
groundsel, common	P/C⁺	—	C	—	P	N	C	C	C	—	C	P	C	N	N	—	—	C	C	—	C
henbit	N/P⁺	—	C	—	C	N	C	C	C	—	C	P	C	C	N	P	C	P	P	C	C
knotweed, prostrate	N	—	C	N	C	N	—	C	P	C	C	N	N	N	N	—	C	C	P	C	C
ladysthumb	P/C	—	—	C	C	N	—	C	—	C	C	P	P	N	N	C	C	C	—	—	C
lettuce, prickly	C	—	C	—	P	N	P	C	P	—	C	P	C	N	N	—	C	C	C⁺	—	C
mallow, little (cheeseweed)	N	P	C	N	C	N	C	C	P	C	P	P	N	N	N	—	C	C	—	—	P
milkthistle, blessed	N	—	—	—	C	N	—	—	C	—	P	P	P	N	N	—	—	—	—	—	C
miner's lettuce	N	—	C	—	P	N	C	—	C	C	N	C	C	C	N	—	—	—	C	—	N
mustards	C	P	C	N	C	N	C	P	C	—	C	C	C	P	N	C	—	C	C	—	C
nettle, burning	N	C	—	—	N	N	C	—	C	—	N	—	N	N	N	C	C	C	—	—	N
oat, wild	N	N	C	N	N	C	C	N	C	C	N	C	P/C⁺	C	C	C	N	—	—	P	N
oxtongue, bristly	C	—	C	—	P	N	—	—	—	—	P	—	—	N	N	—	—	—	—	—	C
pimpernel, scarlet	—	—	C	—	—	N	—	—	C	—	—	—	—	N	N	—	—	—	—	—	—
pineappleweed	C	—	C	—	P	N	—	—	—	—	C	P	C	N	N	—	C	—	C	—	C
radish, wild	P	P	C	—	P	N	C	C	C	C	P/C⁺	C	P/C⁺	N	N	C	C	—	P	—	C
redmaids (desert rockpurslane)	N	—	C	—	C	N	—	—	C	—	C	N	C	C	N	—	—	—	P	—	C
rocket, London	C	C	C	P	C	N	C	C	C	C	C	—	C	P	N	—	C	C	C	—	C
ryegrass, Italian	N	N	C	N	N	N²	C	N	C²	C	N	C²	P/C⁺²	C	C	C	N	—	—	C	N
shepherd's-purse	C	P	C	P	C	N	C	C	C	C	C	—	C	P	N	C⁺	C	C	C	P	C
smartweed, pale	P/C	—	—	C	C	N	—	C	—	C	C	—	P	—	N	—	—	C	—	—	C
sowthistle, annual	C	P	C	P	C	N	—	C	C	C	P	—	C	N	N	—	C	C	P	—	C
sowthistle, spiny	N	—	—	P	C	N	—	—	C	—	—	—	N	N	N	—	—	C	—	—	—
spurry, corn	N	—	C	—	N	N	—	—	C	—	N	—	C	N	N	—	—	—	C	—	N
stickleaf	N	—	C	—	—	N	—	—	C	—	N	—	—	N	N	—	—	—	—	—	N
tarweeds	C	—	C	—	C	N	—	C	C	—	P	—	C	N	N	—	—	—	—	—	P

= control

= partial control

= no control

—

= no information

BRO	= bromoxynil (Maestro 4EC)	FLR	= fluroxypyr* (Cleansweep M)	PIN	= pinoxaden (Axial XL)
CAR	= carfentrazone (Shark EW)	GLY	= glyphosate (Roundup PowerMax)	PYO	= pyroxsulam (Simplicity CA)
CHS	= chlorsulfuron (Glean XP)	IMZ	= imazamox (Beyond Xtra)	PYR	= pyraflufen-ethyl (ETX Herbicide/Defoliant)
CLO	= clopyralid (Stinger)	MCA	= MCPA Amine* (MCPA Amine 4)	SAF	= saflufenacil (Sharpen)
DIC	= dicamba* (Clarity)	MES	= mesosulfuron (Osprey)	TRB	= tribenuron-methyl (Express Herbicide)
FEN	= fenoxaprop (Puma 1EC)	PAR	= paraquat* (Gramoxone SL 3.0)	TRI	= trifluralin (Treflan HFP)
FLM	= flumioxazin (Chateau EZ)	PEN	= pendimethalin (Prowl H20)	24D	= 2,4-D Amine* (2,4-D Amine 4)

*	Permit required from county agricultural commissioner for purchase or use.
+	Control varies depending on size of weed at application: the smaller the weed, the better the control.
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.
²	Resistance is known to occur.

Text Updated: 12/25