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How to Manage Pests

UC Pest Management Guidelines

| More pests | More crops | About guidelines |

Walnut

Susceptibility of Weeds to Herbicide Control

(Reviewed 12/07, updated 12/07)

In this Guideline:

Winter weeds
Summer weeds
Legends
Publication
Glossary

More about weeds in walnut:

Susceptibility of Winter Weeds to Herbicide Control

Customize list of weeds

ANNUAL WEEDS

barley, hare

bluegrass, annual

bromegrasses

canarygrass

clovers

cudweeds

fiddlenecks

filarees

groundsel, common

henbit

lettuce, miner's

mustards

nettles

oat, wild

polypogon, rabbitfoot

radish, wild

redmaids (desert rockpurslane)

rocket, London

ryegrasses

shepherd's-purse

sowthistles

PREEMERGENT
DIU	NAP	NOR	ORY	OXY	PEN	SIM	TRI
C	C	C	C	P	C	C	C
C	C	C	C	P	C	C	C
C	C	C	C	P	C	C	C
C	C	C	C	P	C	C	C
P	P	N	N	C	P	C	N
C	C	C	N	N	N	C	N
C	C	C	C	C	C	C	P
C	C	C	N	C	C	C	P
P	C	P	N	C	P	C	N
C	P	P	P	C	C	C	C
C	C	C	C	C	C	C	C
C	P	C	N	C	N	C	N
C	N	C	P	C	N	C	N
P	C	P	C	P	P	C	P
C	C	C	C	P	C	C	C
C	P	P	N	C	N	C	N
C	N	C	C	C	C	C	C
C	P	C	N	C	C	C	N
C	C	C	C	P	C	C	C
C	N	C	N	C	N	C	N
C	C	P	N	C	N	C	N

POSTEMERGENT
24D*	FLU	GLY	OXY	PAR*	SET
N	C	C	P	C	C
N	N	C	P	C	N
N	C	C	N	C	C
N	C	C	N	C	C
P	N	C	P	P	N
P	N	C	P	N	N
P	N	C	C	C	N
C	N	P	P	P	N
C	N	C	C	C	N
C	N	C	C	C	N
C	N	C	C	C	N
C	N	C	P	C	N
C	N	C	P	C	N
N	C	C	N	C	C
N	C	C	N	C	C
P	N	C	P	P	N
C	N	C	C	C	N
C	N	C	C	C	N
N	C	C	N	C	C
C	N	C	P	C	N
C	N	C	P	C	N

COMBINATIONS
ORY OXY	GLY¹ OXY	GLY¹ ORY	GLY¹ 24D*	GLY¹ SIM ORY
P	C	C	C	C
C	C	C	C	C
P	C	C	C	C
N	C	C	C	C
P	P	P	P	P
P	C	C	C	C
C	C	C	C	C
P	C	P	C	C
C	C	C	C	C
C	C	C	C	C
C	C	C	C	C
P	C	C	C	C
P	C	C	C	C
P	C	C	C	C
N	C	C	C	C
P	C	C	C	C
C	C	C	C	C
P	C	C	C	C
N	C	C	C	C
P	C	C	C	C
P	C	C	C	C

ANNUAL WEEDS

barley, hare

bluegrass, annual

bromegrasses

canarygrass

clovers

cudweeds

fiddlenecks

filarees

groundsel, common

henbit

lettuce, miner's

mustards

nettles

oat, wild

polypogon, rabbitfoot

radish, wild

redmaids (desert rockpurslane)

rocket, London

ryegrasses

shepherd's-purse

sowthistles

Susceptibility of Spring/Summer Weeds to Herbicide Control

Customize list of weeds

ANNUAL WEEDS

barnyardgrasses

chickweed, common

cockleburs

crabgrasses

cudweeds

fleabane, hairy

foxtails

goosefoot, nettleleaf

groundcherries

horseweed

knotweed, prostrate

lambsquarters, common

lettuce, prickly

lovegrasses

mallow, little (cheeseweed)

nettles

nightshades

pigweeds

pineapple-weed

polypogon, rabbitfoot

puncturevine

purslane, common

sandburs

sowthistles

speedwells

spurges

thistle, Russian

witchgrass

PERENNIAL SEEDINGS

bermudagrass

bindweed, field

dallisgrass

dandelion

dock, curly

johnsongrass

ESTABLISHED PERENNIALS

asparagus

bermudagrass

bindweed, field

blackberries

clovers

dallisgrass

dandelion

dock, curly

false dandelion

johnsongrass

nutsedge, yellow

onion, wild

poison-oak, Pacific

sorrel, red

PREEMERGENT
DIU	NAP	NOR	ORY	OXY	PEN	SIM	TRI
C	C	C	C	P	C	P	C
C	C	C	C	P	C	C	C
P	C	N	N	P	N	P	—
C	C	C	C	P	C	N	C
C	C	C	N	N	C	C	N
C	N	P	N	P	N	C	N
C	C	C	C	N	C	C	C
C	C	C	C	C	P	C	C
N	N	C	C	C	C	C	N
P	N	P	N	P	N	C	N
C	C	C	C	C	C	C	C
C	C	P	C	C	C	C	C
C	C	P	N	C	N	C	N
C	C	C	C	P	C	P	C
P	P	C	N	C	P	N	P
C	P	C	P	C	C	C	N
C	N	C	N	C	P	C	N
C	C	P	C	C	C	C	C
P	C	C	N	C	C	C	P
C	C	C	C	—	C	C	C
C	P	C	P	P	P	P	P
C	C	P	C	C	C	C	C
C	C	C	C	N	C	P	C
P	C	P	N	C	N	C	N
P	C	—	P	C	P	C	—
C	N	C	P	P	C	C	C
C	P	C	P	P	P	C	P
P	C	C	C	P	C	C	C

C	C	C	C	N	C	P	C
N	N	N	C	C	P	N	C
C	P	C	C	N	C	C	C
C	C	N	N	C	N	C	N
C	P	N	P	C	C	C	C
C	P	C	P	N	P	P	C

N	—	N	N	—	N	N	N
N	N	P	N	N	N	N	N
N	N	N	P	N	N	N	P
N	N	N	N	N	N	N	N
N	N	N	N	N	N	N	N
N	N	N	N	N	N	N	N
N	N	N	N	N	N	N	N
N	N	N	N	N	N	N	N
N	N	C	N	N	N	N	N
N	N	N	N	N	N	N	P
N	N	P	N	N	N	N	N
—	—	—	N	N	—	—	N
N	N	N	N	N	N	N	N
N	N	N	N	N	N	N	N

POSTEMERGENT
24D*	FLU	GLY	OXY	PAR*	SET
N	C	C	N	P	C
P	N	C	P	C	N
C	N	C	C	C	N
N	C	C	P	C	C
P	N	C	P	N	N
C	N	C	P	C	N
N	C	C	N	C	C
C	N	C	P	C	N
C	N	C	C	C	N
C	N	C	P	C	N
N	N	C	P	P	N
C	N	C	C	P	N
C	N	C	C	C	N
N	C	C	N	C	C
C	N	P	C	N	N
C	N	C	P	C	N
C	N	C	C	C	N
C	N	C	C	C	N
C	N	C	P	C	N
N	C	C	N	C	C
C	N	C	P	C	N
C	N	C	C	C	N
N	C	C	N	P	C
C	N	C	C	C	N
P	N	C	P	C	N
P	N	C	P	C	N
P	N	C	P	P	N
N	C	C	N	C	C

N	C	C	P	C	C
C	N	C	C	C	N
N	C	C	N	C	C
C	N	C	C	N	N
C	N	C	C	C	N
P	C	C	N	C	C

N	N	P	N	N	N
N	P	C	N	P	P
P	N	P	N	P	N
P	N	C	N	N	N
P	N	P	N	N	N
N	P	C	N	N	P
C	N	P	N	N	N
C	N	P	N	N	N
C	N	P	N	N	N
N	P	C	N	N	P
P	N	P	N	N	N
—	N	—	N	—	N
P	N	C	N	N	N
N	N	P	N	N	N

COMBINATIONS
ORY OXY	GLY¹ OXY	GLY¹ ORY	GLY¹ 24D*	GLY¹ SIM ORY
N	C	C	C	C
C	C	P	P	P
P	C	C	C	C
C	C	C	C	C
P	C	C	C	C
P	C	P	C	C
P	C	C	C	C
C	C	C	C	C
C	C	C	C	C
C	C	C	C	C
P	C	P	P	C
C	C	C	C	C
P	C	C	C	C
P	C	C	C	C
C	C	C	C	C
P	C	C	C	C
C	C	C	C	C
P	C	C	C	C
P	C	C	C	C
N	C	C	C	C
N	C	C	C	C
P	C	C	C	C
P	C	C	C	C
C	C	C	C	C
P	C	C	C	C
C	C	C	C	C
N	C	C	C	C
N	C	C	C	C

C	C	C	C	C
P	C	C	C	C
C	C	C	C	C
C	C	C	C	C
C	C	C	C	C
P	C	C	C	C

N	C	C	—	C
N	N	N	—	N
N	N	N	—	N
N	N	N	—	N
N	P	P	—	P
N	N	N	—	N
P	P	P	—	P
N	N	N	—	N
N	P	P	—	P
N	N	N	—	N
N	N	N	—	N
—	—	—	—	—
N	N	N	—	N
N	N	N	—	N

ANNUAL WEEDS

barnyardgrasses

chickweed, common

cockleburs

crabgrasses

cudweeds

fleabane, hairy

foxtails

goosefoot, nettleleaf

groundcherries

horseweed

knotweed, prostrate

lambsquarters, common

lettuce, prickly

lovegrasses

mallow, little (cheeseweed)

nettles

nightshades

pigweeds

pineapple-weed

polypogon, rabbitfoot

puncturevine

purslane, common

sandburs

sowthistles

speedwells

spurges

thistle, Russian

witchgrass

PERENNIAL SEEDINGS

bermudagrass

bindweed, field

dallisgrass

dandelion

dock, curly

johnsongrass

ESTABLISHED PERENNIALS

asparagus

bermudagrass

bindweed, field

blackberries

clovers

dallisgrass

dandelion

dock, curly

false dandelion

johnsongrass

nutsedge, yellow

onion, wild

poison-oak, Pacific

sorrel, red

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

Chemical Legend

24D = 2,4-D* (Orchard Master)

DIU = diuron (Karmex)

FLU = fluazifop-p-butyl (Fusilade 2000)

GLY = glyphosate (Roundup, Touchdown)

NAP = napropamide (Devrinol)

NOR = norflurazon (Solicam)

ORY = oryzalin (Surflan)

OXY = oxyfluorfen (Goal)

PAR = paraquat* (Gramoxone Inteon)

PEN = pendimethalin (Prowl)

SET = sethoxydim (Poast)

SIM = simazine (Princep)

TRI = trifluralin (Treflan)

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.

PUBLICATION

UC IPM Pest Management Guidelines: Walnut
UC ANR Publication 3471
Weeds
A. Shrestha, UC IPM Program, Kearney Agricultural Center, Parlier
R. B. Elkins, UC Cooperative Extension, Lake Co.
J. K. Hasey, UC Cooperative Extension, Sutter/Yuba counties
K. K. Anderson, UC Cooperative Extension, Stanislaus Co.
J. A. Grant, UC Cooperative Extension, San Joaquin Co.
Acknowledgment for contributions to the weeds section:
C. L. Elmore, Vegetable Crops/Weed Science, UC Davis
G. S. Sibbett, UC Cooperative Extension, Tulare Co.
W. O. Reil, UC Cooperative Extension, Yolo Co.
T. S. Prather, Department of Plant, Soil, and Entomological Sciences (PSES), University of Idaho, Moscow, ID
J. J. Stapleton, UC IPM Program, Kearney Agricultural Center, Parlier

Statewide IPM Program, Agriculture and Natural Resources, University of California
All contents copyright © 2007 The Regents of the University of California. All rights reserved.

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