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  4. Susceptibility of Weeds to Herbicide Control
Agriculture: Walnut Pest Management Guidelines

Susceptibility of Weeds to Herbicide Control

Weeds Pages

Susceptibility of Winter Weeds to Herbicide Control

PREEMERGENCE POSTEMERGENCE
DIU NOR ORY OXY PEN SIM TRI 24D* FLU GLY OXY PAR* SET
Mode of Action 1 7 12 3 14 3 5 3 4 1 9 14 22 1
ANNUAL WEEDS
barley, hare C C C P C C C N C C P C C
bluegrass, annual C C C P C C C N N C P C N
bromegrasses C C C P C C C N C C N C C
canarygrass C C C P C C C N C C N C C
clovers P N N C P C N P N C P P N
cudweeds C C N N N C N P N C P N N
fiddlenecks C C C C C C P P N C C C N
filarees C C N C C C P C N P P P N
groundsel, common P P N C P C N C N C C C N
henbit C P P C C C C C N C C C N
lettuce, miner's C C C C C C C C N C C C N
mustards C C N C N C N C N C P C N
nettles C C P C N C N C N C P C N
oat, wild P P C P P C P N C C N C C
polypogon, rabbitfoot C C C P C C C N C C N C C
radish, wild C P N C N C N P N C P P N
redmaids (desert rockpurslane) C C C C C C C C N C C C N
rocket, London C C N C C C N C N C C C N
ryegrasses C C C P C C C N C C N C C
shepherd's-purse C C N C N C N C N C P C N
sowthistles C P N C N C N C N C P C N

Susceptibility of Spring/Summer Weeds to Herbicide Control

PREEMERGENCE POSTEMERGENCE
DIU NOR ORY OXY PEN SIM TRI 24D* FLU GLY OXY PAR* SET
Mode of Action1 7 12 3 14 3 5 3 4 1 9 14 22 1
ANNUAL WEEDS
barnyardgrasses C C C P C P C N C C N P C
chickweed, common C C C P C C C P N C P C N
cockleburs P N N P N P — C N C C C N
crabgrasses C C C P C N C N C C P C C
cudweeds C C N N C C N P N C P N N
fleabane, hairy C P N P N C N C N C P C N
foxtails C C C N C C C N C C N C C
goosefoot, nettleleaf C C C C P C C C N C P C N
groundcherries N C C C C C N C N C C C N
horseweed P P N P N C N C N C P C N
knotweed, prostrate C C C C C C C N N C P P N
lambsquarters, common C P C C C C C C N C C P N
lettuce, prickly C P N C N C N C N C C C N
lovegrasses C C C P C P C N C C N C C
mallow, little (cheeseweed) P C N C P N P C N P C N N
nettles C C P C C C N C N C P C N
nightshades C C N C P C N C N C C C N
pigweeds C P C C C C C C N C C C N
pineapple-weed P C N C C C P C N C P C N
polypogon, rabbitfoot C C C — C C C N C C N C C
puncturevine C C P P P P P C N C P C N
purslane, common C P C C C C C C N C C C N
sandburs C C C N C P C N C C N P C
sowthistles P P N C N C N C N C C C N
speedwells P — P C P C — P N C P C N
spurges C C P P C C C P N C P C N
thistle, Russian C C P P P C P P N C P P N
witchgrass P C C P C C C N C C N C C
PERENNIAL SEEDINGS
bermudagrass C C C N C P C N C C P C C
bindweed, field N N C C P N C C N C C C N
dallisgrass C C C N C C C N C C N C C
dandelion C N N C N C N C N C C N N
dock, curly C N P C C C C C N C C C N
johnsongrass C C P N P P C P C C N C C
ESTABLISHED PERENNIALS
asparagus N N N — N N N N N P N N N
bermudagrass N P N N N N N N P C N P P
bindweed, field N N P N N N P P N P N P N
blackberries N N N N N N N P N C N N N
clovers N N N N N N N P N P N N N
dallisgrass N N N N N N N N P C N N P
dandelion N N N N N N N C N P N N N
dock, curly N N N N N N N C N P N N N
false dandelion N C N N N N N C N P N N N
johnsongrass N N N N N N P N P C N N P
nutsedge, yellow N P N N N N N P N P N N N
onion, wild — — N N — — N — N — N — N
poison-oak, Pacific N N N N N N N P N C N N N
sorrel, red N N N N N N N N N P N N N

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

24D = 2,4-D* (Orchard Master) GLY = glyphosate (Roundup) OXY = oxyfluorfen (Goal) SET = sethoxydim (Poast)
DIU = diuron (Diuron) NOR = norflurazon (Solicam) PAR = paraquat* (Gramoxone) SIM = simazine (Princep)
FLU =fluazifop-p-butyl (Fusilade DX) ORY = oryzalin (Surflan) PEN = pendimethalin (Prowl) TRI = trifluralin (Treflan)

* Permit required from county agricultural commissioner for purchase or use.
1Group 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. For more information, see http://wssa.net/wssa/weed/herbicides/
Text Updated: 08/17
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