Agriculture: Onion and Garlic Pest Management Guidelines

Susceptibility of Weeds to Herbicide Control

BEN BRO CLE DCP DIM ETH FLM FLU GLY MET* OXY PAR* PEN SET
Mode of Action1 8 6 1 3 15 8 14 1 9 27 14 22 3 3
ANNUAL WEEDS
barley, hare P N C C C P C C C P P P C
barnyardgrass C N C C C P C C C C P P C C
bluegrass, annual C N C C C C C N C C P P C N
burclover, California N N N P N P N P P N N
canarygrass C N C C C C C C P P C C
cereals N N C C C C C P P P C
chickweed, common P N N C C C C N C C N C C N
crabgrasses C N C C P C C C C N C C C
cudweeds N C N N C C N C C N N N N
dodders N N N C N N C C N C N N
fiddlenecks N C N C C C N C C C P C N
filarees N P N P P C N P C C P N N
fleabane, hairy N C N N P P N C C P C N N
foxtails C N C C C C C C C C N C C C
goosefoot P C N C C C N C C C C C N
groundcherries N C N C C C C N C C C C P N
groundsel N C N N P C N C C C C N N
henbit N C N P P C N C C C C C N
horseweed N C N N P C N C C P P N N
knotweed, common C P N P C C N C C P P C N
kochia C N P N C N C C P P C N
lambsquarters, common P C N C C C N C C C P C N
lettuce, prickly N C N N C P N C C C P N N
lovegrasses C N C C C C C C P C C
mallow, little (cheeseweed) N P N N P C N P N C N P N
morningglories N C N N C C N C P C P N N
mustards N C N P N C N C C C C N N
nettles N C N P C P C N N C C P N N
nightshade, black N C N P P P N C P C C N N
nightshade, hairy N C N P P C N C C C C N N
oat, wild N N C P C C C C C P P P C
panicum, fall C N C C C C N P C C
pigweeds C C N C C P C N C C C C C N
puncturevine N C N P C C N C C C C P N
purslane, common C N N C C C C N C C C C C N
radish, wild N C N N N C N C C P C N N
rocket, London N C N P N C N C C C C C N
ryegrasses P N C C N P C C C N P C C
shepherd's-purse N C N N N C N C C C P N N
sowthistles N C N P C P N C C C P N N
sunflowers N C N P N N C C C P N N
sweetclovers N N N N C N P N P P N N
swinecress, greater N N/P N C C C C N/P N
thistle, Russian N C N N P C N C C P C P N
PERENNIAL WEEDS
bermudagrass (established) N N P N N N P C P N N N P
bermudagrass (seedling) N N C C N C C C N P C C
bindweed, field (established) N N N N N N N N P P N N N N
bindweed, field (seedling) N P N N N N N C P N P P N
dock, curly (established) N N N N N N N C N N N N
dock, curly (seedling) P C N C N C C C C C N
johnsongrass (established) N N C N N N C C C N N N C
johnsongrass (seedling) C N C C C C C C C C N C C C
nutsedge, purple N N N N P N N P N N N N N
nutsedge, yellow N N N N P P P N P P N N N N
thistle, Canada N N N N P N N N N
C= control P= partial control N= no control = no information
BEN = bensulide (Prefar) FLU = fluazifop-P-butyl (Fusilade)
BRO = bromoxynil (Brox) GLY = glyphosate (Roundup)
CLE = clethodim (Select Max) MET = metam sodium or potassium* (Vapam, etc.)
DCP = DCPA (Dacthal) OXY = oxyfluorfen (Goal, GoalTender)
DIM = dimethenamid (Outlook) PAR = paraquat* (Gramoxone)
ETH = ethofumesate (Ethofumesate) PEN = pendimethalin (Prowl)
FLM = flumioxazin (Chateau) SET = sethoxydim (Poast)
* Permit required from county agricultural commissioner for purchase or use.
1 Group 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.
Text Updated: 09/18