Agriculture: Pear Pest Management Guidelines

Susceptibility of Weeds in Pear to Herbicide Control

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