Agriculture: Pear Pest Management Guidelines

Susceptibility of Weeds in Pear to Herbicide Control

Weeds Pages

Spring and Summer Weeds in Pear
	PREEMERGENCE
	DIC	DIU	ISO²	NOR	ORY	OXY	PEN	PRO	RIM	SIM
ANNUAL WEEDS
Barnyardgrass	C	C	N	C	P	C	C	C	C	P
Chickweed, Common	C	C	—	C	P	C	C	C	C	C
Cockleburs	P	C	P	—	P	N	N	N	P	P
Crabgrass, Large	P	C	N	C	P	C	C	C	C	N
Cudweeds	C	C	P	C	N	N	N	N	C	C
Fleabane, Hairy	C	C	P	P	P	N	N	N	C	C
Foxtails	C	C	N	C	N	C	C	C	C	C
Goosefoot, Nettleleaf	C	C	C	C	C	C	P	C	P	C
Groundcherries	C	N	C	C	C	C	C	C	P	C
Groundsel, Common	C	N	C	P	C	P	P	N	C	C
Horseweed	C	P	P	P	P	N	N	N	C	C
Knotweed, Common	C	C	C	C	C	C	C	C	P	C
Ladysthumb	—	C	—	—	—	—	—	—	—	C
Lambsquarters, Common	C	C	C	P	C	C	C	C	P	C
Lettuce, Prickly	C	C	C	P	C	N	N	N	C	C
Lovegrasses	P	C	N	C	P	C	C	C	P	P
Mallow, Little (Cheeseweed)	C	P	—	C	C	N	P	—	C	N
Nettles	C	C	—	C	C	P	C	C	N	C
Nightshades	C	C	C	C	C	N	P	C	C	C
Pigweeds	P	C	C	P	C	C	C	C	C	C
Pineapple-weed	C	P	—	C	C	N	C	N	P	C
Polypogon, Rabbitfoot	C	C	—	C	P	C	C	—	C	C
Puncturevine	P	C	P	C	P	P	P	N	P	P
Purslane, Common	C	C	C	P	C	C	C	C	C	C
Sandburs	C	C	N	C	N	C	C	—	—	P
Smartweed, Pale	—	C	—	—	—	—	—	—	—	C
Sowthistles	C	P	C	P	C	N	N	N	C	C
Speedwell	—	P	—	—	C	P	P	—	N	C
Spurges	C	C	C	P	P	P	C	P	C	C
Thistle, Russian	C	C	P	C	P	P	P	P	N	C
Witchgrass	—	P	N	C	P	C	C	—	C	C
PERENNIAL SEEDINGS
Bermudagrass	C	C	N	C	N	C	C	C	N	P
Bindweed, Field	C	N	N	N	C	C	P	N	P	N
Dallisgrass	C	C	N	C	N	C	C	C	—	C
Dandelion	C	C	C	C	N	C	N	N	C	C
Dock, Curly	C	C	C	N	P	C	C	C	P	C
Johnsongrass	C	C	N	C	N	P	P	C	C	P
ESTABLISHED PERENNIALS
Asparagus	N	N	—	N	N	N	N	—	—	N
Bermudagrass	N	N	N	P	N	N	N	N	N	N
Bindweed, field	P	N	N	N	P	N	N	N	P	N
Blackberries	N	N	—	N	N	N	N	—	—	N
Clover, White	N	N	C	N	N	N	N	N	P	N
Dallisgrass	N	N	N	N	N	N	N	N	—	N
Dandelion	P	N	—	N	N	N	N	N	P	N
Dock, Curly	N	N	N	N	N	N	N	N	N	N
Johnsongrass	N	N	N	N	N	N	N	N	P	N
Nutsedge, yellow	P	N	N	P	N	N	N	N	P	N
Poison-oak, Pacific	N	N	—	N	N	N	N	—	—	N
Smartweed, Water	N	N	—	N	N	N	N	—	—	N
Sorrel, Red	P	N	—	N	N	N	N	—	—	N

Spring and Summer Weeds in Pear
	POSTEMERGENCE
	24D	CAR	CLE²	FLM²	FLU	GLY	OXY	PAR*	SET
ANNUAL WEEDS
Barnyardgrass	N	N	C	—	C	C	N	P	C
Chickweed, Common	P	P	N	C	N	C	P	C	N
Cockleburs	C	P	N	—	N	C	C	C	N
Crabgrass, Large	N	N	C	P	C	C	P	C	C
Cudweeds	P	—	N	—	N	C	P	N	N
Fleabane, Hairy	C	N	N	C	N	C	P	C	N
Foxtails	N	N	C	—	C	C	N	C	C
Goosefoot, Nettleleaf	C	—	N	—	N	C	P	C	N
Groundcherries	C	C	N	—	N	C	C	C	N
Groundsel, Common	C	—	N	C	N	C	C	C	N
Horseweed	C	N	N	C	N	C	P	C	N
Knotweed, Common	P	—	N	—	N	C	P	P	N
Ladysthumb	—	—	—	—	N	C	—	P	N
Lambsquarters, Common	C	—	N	C	N	C	C	P	N
Lettuce, Prickly	C	—	N	—	N	C	C	C	N
Lovegrasses	N	N	C	—	C	C	N	C	C
Mallow, Little (Cheeseweed)	P	C	N	—	N	P	C	N	N
Nettles	P	C	N	C	N	C	P	C	N
Nightshades	C	N	N	C	N	C	C	C	N
Pigweeds	P	—	N	—	N	C	C	C	N
Pineapple-weed	P	N	N	—	N	C	P	C	N
Polypogon, Rabbitfoot	N	N	C	—	C	C	N	C	C
Puncturevine	C	—	N	—	N	C	P	C	N
Purslane, Common	C	N	N	C	N	C	C	C	N
Sandburs	—	—	N	—	C	C	N	P	C
Smartweed, Pale	P	—	N	—	N	C	—	P	N
Sowthistles	C	N	N	C	N	C	C	C	N
Speedwell	—	N	N	—	N	C	P	C	N
Spurges	P	—	N	—	N	C	—	C	N
Thistle, Russian	C	—	N	—	N	C	P	P	N
Witchgrass	N	N	—	N	C	C	N	C	C
PERENNIAL SEEDINGS
Bermudagrass	N	N	C	—	C	C	P	C	C
Bindweed, Field	C	C	N	—	N	C	C	C	N
Dallisgrass	N	N	P	—	C	C	N	C	C
Dandelion	C	—	N	—	N	P	C	C	N
Dock, Curly	C	—	N	—	N	P	C	C	N
Johnsongrass	N	N	C	—	C	C	N	C	C
ESTABLISHED PERENNIALS
Asparagus	—	—	N	—	N	P	N	N	N
Bermudagrass	N	N	P	—	P	C	N	P	P
Bindweed, field	P	P	N	—	N	P	N	P	N
Blackberries	—	—	N	—	N	C	N	N	N
Clover, White	P	—	N	C	N	P	N	N	N
Dallisgrass	N	N	C	—	P	C	N	N	P
Dandelion	C	—	N	—	N	P	N	N	N
Dock, Curly	C	—	N	—	N	P	N	N	N
Johnsongrass	N	N	C	—	P	C	N	N	P
Nutsedge, yellow	N	N	N	P	N	P	N	N	N
Poison-oak, Pacific	—	—	N	—	N	C	N	N	N
Smartweed, Water	P	—	N	—	N	C	N	N	N
Sorrel, Red	—	—	N	—	N	P	N	N	N

Winter Weeds in Pear
	PREEMERGENCE
	DIC	DIU	ISO¹	NOR	ORY	OXY	PEN	PRO	RIM	SIM
ANNUAL WEEDS
Barley, Hare	C	C	N	C	C	P	C	C	C	C
Bluegrass, Annual	C	C	N	C	C	P	C	C	C	C
Bromegrasses	C	C	N	C	C	P	C	C	C	C
Canarygrasses	C	C	N	C	C	P	C	C	—	C
Burclover, California	—	P	—	N	N	C	P	—	—	C
Cudweeds	C	C	C	C	N	N	N	N	C	C
Fiddlenecks	C	C	C	C	C	C	C	C	C	C
Filarees	C	C	C	C	N	C	C	N	C	C
Groundsel, Common	C	P	C	P	N	C	P	N	C	C
Henbit	C	C	C	P	P	C	C	C	C	C
Miner's Lettuce	C	C	—	C	C	C	C	P	C	C
Mustards	C	C	C	P	N	C	N	C	C	C
Nettle	C	C	C	C	P	C	C	C	N	C
Oat, Wild	P	P	N	P	C	P	P	P	P	C
Polypogon, Rabbitfoot	—	—	—	C	C	P	C	—	C	—
Radish, Wild	C	C	C	N	N	C	N	P	C	C
Redmaids (Desert Rockpurslane)	C	C	—	C	C	C	C	—	C	C
Rocket, London	C	C	C	C	N	C	C	C	C	C
Ryegrass, Italian	—	C	N	C	C	P	C	C	C	C
Shepherd's-purse	C	C	C	C	N	C	N	C	C	C
Sowthistles	C	C	C	P	N	C	N	N	C	C
Sweetclover, Yellow	—	P	C	N	N	C	P	N	—	C

Winter Weeds in Pear
	POSTEMERGENCE
	24D	CAR	CLE¹	FLU	GLY	OXY	PAR*	SET
ANNUAL WEEDS
Barley, Hare	N	N	C	C	C	P	C	C
Bluegrass, Annual	N	N	C	N	C	P	C	N
Bromegrasses	N	N	C	C	C	N	C	C
Canarygrasses	N	N	C	C	C	N	C	C
Burclover, California	—	—	N	N	C	P	P	N
Cudweeds	P	—	N	N	C	P	N	N
Fiddlenecks	P	C	N	N	C	C	C	N
Filarees	C	—	N	N	P	P	P	N
Groundsel, Common	C	—	N	N	C	C	C	N
Henbit	P	—	N	N	C	C	C	N
Miner's Lettuce	—	—	N	N	C	C	C	N
Mustards	C	P	N	N	C	P	C	N
Nettle	P	C	N	N	C	P	C	N
Oat, Wild	N	N	C	C	C	N	C	C
Polypogon, Rabbitfoot	N	N	C	C	C	—	C	C
Radish, Wild	C	P	N	N	C	P	P	N
Redmaids (Desert Rockpurslane)	—	—	N	N	C	C	C	N
Rocket, London	C	C	N	N	C	C	C	N
Ryegrass, Italian	N	N	C	C	C	N	C	C
Shepherd's-purse	C	P	N	N	C	P	C	N
Sowthistles	C	N	N	N	C	P	C	N
Sweetclover, Yellow	—	—	N	N	C	P	P	N

Ratings Legend
C	= control		P	= partial control		N	= no control		—	= no information

Chemical Legend
24D = 2,4-D (Orchard Master)	NOR = norflurazon (Solicam)
CAR = carfentrazone (Shark)	ORY = oryzalin (Surflan)
CLE = clethodim (Select Max)	OXY = oxyfluorfen (GoalTender)
DIC = dichlobenil (Casaron)	PAR = paraquat* (Gramoxone Inteon)
DIU = diuron (Karmex)	PEN = pendimethalin (Prowl H20)
FLM = flumioxazin (Chateau)	PRO = pronamide (Kerb)
FLU = fluazifop-p-butyl (Fusilade DX)	RIM = rimsulfuron (Matrix)
GLY = glyphosate (Roundup WeatherMax, etc)	SET = sethoxydim (Poast)
ISO = isoxaben (Gallery)	SIM = simazine (Princep)

Comments
^* Permit required from county agricultural commissioner for purchase or use.
¹ At rates used for annual weeds, control of perennials is less than expected with high label rates.
² Registered for use in nonbearing orchards only.

Text Updated: 11/12