1. UC IPM
  2. Agriculture
  3. Onion and Garlic
  4. Susceptibility of Weeds to Herbicide Control

Agriculture: Onion and Garlic Pest Management Guidelines

Susceptibility of Weeds to Herbicide Control

Weeds Pages

BEN BRO CLE DIM ETH FLM FLU GLY MET* OXY PAR* PEN SET
Mode of Action1 8 6 1 15 8 14 1 9 27 14 22 3 3
ANNUAL WEEDS
barley, hare P N — C C P C C C P P P C
barnyardgrass C N C C P C C C C P P C C
bluegrass, annual C N 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 P P C C
cereals N N — — C — C C C P P P C
chickweed, common P N N C C C N C C N C C N
crabgrasses C N — C P C C C C N C C C
cudweeds N C N — C C N C C N N N N
dodders N N N — N — N C C N C N N
fiddlenecks N C N — C C N C C C P C N
filarees N P N — P C N P C C P N N
fleabane, hairy N C N — P P N C C P C N N
foxtails C N C C C C C C C N C C C
goosefoot P C N — C C N C C C C C N
groundcherries N C N C C C N C C C C P N
groundsel N C N — P C N C C C C N N
henbit N C N — P C N C C C C C N
horseweed N C N — P C N C C P P N N
knotweed, common C P N — C C N C C P P C N
kochia — C N N C — N C C P P C N
lambsquarters, common P C N C C — N C C C P C N
lettuce, prickly N C N — C P N C C C P N N
lovegrasses C N — — — C C C C C P C C
mallow, little (cheeseweed) N P N — P C N P N C N P N
morningglories N C N — C C N C P C P N N
mustards N C N — N C N C C C C N N
nettles N C N C P C N N C C P N N
nightshade, black N C N P P — N C P C C N N
nightshade, hairy N C N P C — N C C C C N N
oat, wild N N C — C C C C C P P P C
panicum, fall C N — — — — C C C N P C C
pigweeds C C N C P C N C C C C C N
puncturevine N C N — C C N C C C C P N
purslane, common C N N C C C N C C C C C N
radish, wild N C N — N C N C C P C N N
rocket, London N C N — N C N C C C C C N
ryegrasses P N — C N P C C C N P C C
shepherd's-purse N C N — N C N C C C P N N
sowthistles N C N — C P N C C C P N N
sunflowers N C N — N — N C C C P N N
sweetclovers 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 — P C N C C P C P N
PERENNIAL WEEDS
bermudagrass (established) N N P — N N P C P N N N P
bermudagrass (seedling) N N C — — N C C C N P C C
bindweed, field (established) N N N N N N N P P N N N N
bindweed, field (seedling) N P N — N N N C P N P P N
dock, curly (established) N N N — N N N — C N N N N
dock, curly (seedling) P C N — — — N C C C C C N
johnsongrass (established) N N C — N N C C C N N N C
johnsongrass (seedling) C N C C C C C C C N C C C
nutsedge, purple N N N — P N N P N N N N N
nutsedge, yellow N N N P P P N P P N N N N
thistle, Canada — — 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.)
DIM = dimethenamid (Outlook) OXY = oxyfluorfen (Goal, GoalTender)
ETH = ethofumesate (Ethofumesate) PAR = paraquat* (Gramoxone)
FLM = flumioxazin (Chateau) PEN = pendimethalin (Prowl)
    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

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