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How to Manage Pests

UC Pest Management Guidelines

| More pests | More crops | About guidelines |

Field bindweed (morningglory), Convolvulus arvensis.

Pear

Susceptibility of Weeds to Herbicide Control

(Reviewed 2/07, updated 2/07)

In this Guideline: More about weeds in pear:
Susceptibility of Spring/Summer Weeds to Herbicide Control
Customize list of weeds
 
 
ANNUAL WEEDS
barnyardgrass
chickweed, common
cockleburs
crabgrass, large
cudweeds
fescue, red
fleabane, hairy
foxtails
goosefoot, nettleleaf
groundcherries
groundsel, common
horseweed
knotweed, common
ladysthumb
lambsquarters, common
lettuce, prickly
lovegrasses
mallow, little (cheeseweed)
nettles
nightshades
pigweeds
pineapple-weed
polypogon, rabbitfoot
puncturevine
purslane, common
sandburs
smartweed, pale
sowthistles
speedwell
spurges
thistle, Russian
witchgrass
PERENNIAL SEEDINGS
bermudagrass
bindweed, field
dallisgrass
dandelion
dock, curly
johnsongrass
ESTABLISHED PERENNIALS
asparagus
bermudagrass
bindweed, field
blackberries
clover, white
dallisgrass
dandelion
dock, curly
false dandelion, Carolina
johnsongrass
nutsedge, yellow
poison-oak, Pacific
smartweed, water
sorrel, red
PREEMERGENCE


DIC

DIU

ISO2

NAP

NOR

ORY

OXY

PEN

PRO

SIM

TRI2
CCNCCPCCCPC
CC—CCPCCCCC
PCPC—PNNNPN
PCNCCPCCCNC
CCPCCNNNNCN
CC—CCPCCCC—
CCPNPPNNNCN
CCNCCNCCCCC
CCCCCCCPCCC
CNCNCCCCCCN
CNCPPCPPNCN
CPPNPPNNNCN
CCCCCCCCCCC
—C———————C—
CCCCPCCCCCC
CCCCPCNNNCN
PCNCCPCCCPC
CP—PCCNP—N—
CC—PCCPCCCN
CCCNCCNPCCN
PCCCPCCCCCC
CP—CCCNCNCN
CC—CCPCC—CC
PCPPCPPPNPP
CCCCPCCCCCC
CCNCCNCC—PC
—C———————C—
CPCCPCNNNCN
—P—C—CPP—C—
CCCNPPPCPCP
CCPPCPPPPCP
—PNCCPCC—C—
 
CCNCCNCCCPC
CNNNNCCPNNP
CCNPCNCCCCN
CCCCCNCNNCN
CCCPNPCCCCC
CCNPCNPPCPN
 
NN—NNNNN—N—
NNNNPNNNNNP
PNNNNPNNNNP
NN—NNNNN—N—
NNCNNNNNNNN
NNNNNNNNNNN
PN—NNNNNNNN
NNNNNNNNNNN
PN—NCNNN—N—
NNNNNNNNNNP
PNNNPNNNNNN
NN—NNNNN—N—
NN—NNNNN—N—
PN—NNNNN—N—
POSTEMERGENCE


24D

CAR

CLE2

FLM2

FLU

GLY

OXY

PAR*

SET
NNC—CCNPC
PPNCNCPCN
CPN—NCCCN
NNCPCCPCC
P—N—NCPNN
NN——NCNCN
CNNCNCPCN
NNC—CCNCC
C—N—NCPCN
CCN—NCCCN
C—NCNCCCN
CNNCNCPCN
P—N—NCPPN
————NC—PN
C—NCNCCPN
C—N—NCCCN
NNC—CCNCC
PCN—NPCNN
PCNCNCPCN
CNNCNCCCN
P—N—NCCCN
PNN—NCPCN
NNC—CCNCC
C—N—NCPCN
CNNCNCCCN
——N—CCNPC
P—N—NC—PN
CNNCNCCCN
—NN—NCPCN
P—N—NC—CN
C—N—NCPPN
NN—NCCNCC
 
NNC—CCPCC
CCN—NCCCN
NNP—CCNCC
C—N—NPCCN
C—N—NPCCN
NNC—CCNCC
 
——N—NPNNN
NNP—PCNPP
PPN—NPNPN
——N—NCNNN
P—NCNPNNN
NNC—PCNNP
C—N—NPNNN
C—N—NPNNN
——N—NPNNN
NNC—PCNNP
NNNPNPNNN
——N—NCNNN
P—N—NCNNN
——N—NPNNN
COMBINATIONS

GLY1
ORY
GLY1
OXY		 GLY1
SIM
ORY
OXY
ORY
CCCN
CCCP
CCCC
CCCP
CCCP
CCCN
PCCP
CCCP
CCCC
CCCC
CCCC
PCCP
PCCP
————
CCCC
CCCC
CCCP
PCCC
CCCP
CCCC
CCCC
CCCP
CCCN
CCCP
CCCP
CCCP
————
CCCC
CCCP
CCCC
CCCP
CCCN
 
CCCC
CCCC
CCCP
PCCC
PCCC
CCCP
 
PPPN
CCCN
PNPP
NNNN
NNNN
NNNN
NNNN
NNNN
NNNN
NNNN
NNNN
NNNN
NNNN
NNNN
 
 
 
ANNUAL WEEDS
barnyardgrass
chickweed, common
cockleburs
crabgrass, large
cudweeds
fescue, red
fleabane, hairy
foxtails
goosefoot, nettleleaf
groundcherries
groundsel, common
horseweed
knotweed, common
ladysthumb
lambsquarters, common
lettuce, prickly
lovegrasses
mallow, little (cheeseweed)
nettles
nightshades
pigweeds
pineapple-weed
polypogon, rabbitfoot
puncturevine
purslane, common
sandburs
smartweed, pale
sowthistles
speedwell
spurges
thistle, Russian
witchgrass
PERENNIAL SEEDINGS
bermudagrass
bindweed, field
dallisgrass
dandelion
dock, curly
johnsongrass
ESTABLISHED PERENNIALS
asparagus
bermudagrass
bindweed, field
blackberries
clover, white
dallisgrass
dandelion
dock, curly
false dandelion, Carolina
johnsongrass
nutsedge, yellow
poison-oak, Pacific
smartweed, water
sorrel, red
Susceptibility of Winter Weeds to Herbicide Control
Customize list of weeds
 
 
ANNUAL WEEDS
barley, hare
bluegrass, annual
bromegrasses
canarygrasses
burclover, California
cudweeds
fiddlenecks
filarees
groundsel, common
henbit
miner's-lettuce
mustards
nettle
oat, wild
polypogon, rabbitfoot
radish, wild
redmaids (desert rockpurslane)
rocket, London
ryegrass, Italian
sheperd's-purse
sowthistles
sweetclover, yellow
PREEMERGENCE


DIC

DIU

FLM2

ISO2

NAP

NOR

ORY

OXY

PEN

PRO

SIM

TRI2
CC—NCCCPCCCC
CC—NCCCPCCCC
CC—NCCCPCCCC
CC—NCCCPCCCC
—P——PNNCP—C—
CC—CCCNNNNCN
CC—CCCCCCCCC
CC—CCCNCCNCN
CPCCCPNCPNCN
CCCCPPPCCCCC
CC——CCCCCPCC
CC—CPPNCNCCN
CCCCPCPCCCCN
PPCNCPCPPPCP
————CCCPC——C
CC—CPNNCNPCN
CC——NCCCC—C—
CC—CPCNCCCCN
—C—NCCCPCCCC
CCCCNCNCNCCN
CCCCCPNCNNCN
—PCCPNNCPNC—
POSTEMERGENCE


24D

CAR

CLE2

FLU

GLY

OXY

PAR*

SET
NNCCCPCC
NNCNCPCN
NNCCCNCC
NNCCCNCC
——NNCPPN
P—NNCPNN
PCNNCCCN
C—NNPPPN
C—NNCCCN
P—NNCCCN
——NNCCCN
CPNNCPCN
PCNNCPCN
NNCCCNCC
NNCCC—CC
CPNNCPPN
——NNCCCN
CCNNCCCN
NNCCCNCC
CPNNCPCN
CNNNCPCN
——NNCPPN
COMBINATIONS

GLY
OXY
GLY
ORY		 GLY
SIM
ORY
OXY
ORY
CCCP
CCCC
CCCP
CCCN
PPPP
CCCP
CCCC
CPCP
CCCC
CCCC
CCCC
CCCP
CCCP
CCCP
CCCN
CCCP
CCCC
CCCP
CCCN
CCCP
CCCP
PPPP
 
 
 
ANNUAL WEEDS
barley, hare
bluegrass, annual
bromegrasses
canarygrasses
burclover, California
cudweeds
fiddlenecks
filarees
groundsel, common
henbit
miner's-lettuce
mustards
nettle
oat, wild
polypogon, rabbitfoot
radish, wild
redmaids (desert rockpurslane)
rocket, London
ryegrass, Italian
sheperd's-purse
sowthistles
sweetclover, yellow

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

Chemical Legend
24D = 2,4-D (Clean Crop, Orchard Master)
CAR = carfentrazone (Shark)
CLE = clethodim (Prism)
DIC = dichlobenil (Casaron, Norasac)
DIU = diuron (Karmex)
FLM = flumioxazin (Chateau)
FLU = fluazifop-p-butyl (Fusilade 2000)
GLY = glyphosate (Roundup WeatherMax, etc.)
ISO = isoxaben (Gallery)
NAP = napropamide (Devrinol)
 
NOR = norflurazon (Solicam)
ORY = oryzalin (Surflan)
OXY = oxyfluorfen (Goal)
PAR = paraquat* (Gramoxone Inteon)
PEN = pendimethalin (Prowl)
PRO = pronamide (Kerb)
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.
2   Registered for use in nonbearing orchards only.

[Precautions]

PUBLICATION

[UC Peer Reviewed]

UC IPM Pest Management Guidelines: Pear
UC ANR Publication 3455
Weeds
R. B. Elkins, UC Cooperative Extension, Lake Co.
W. T. Lanini, Weed Science/Plant Sciences, UC Davis
Acknowledgment for contributions to the weed section:
C. L. Elmore, Vegetable Crops/Weed Science, UC Davis
G. T. McGourty, UC Cooperative Extension, Mendocino County

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