1. UC IPM
  2. Agriculture
  3. Small Grains
  4. Susceptibility of Spring and Summer Weeds to Herbicide Control

Agriculture: Small Grains Pest Management Guidelines

Susceptibility of Spring and Summer Weeds to Herbicide Control

Weeds Pages

  PREPLANT (nonselective) POSTPLANT (selective)
  GLY PAR* PYR BRO CAR CHS DIC* FEN FLM FLR IMZ MCA* MES PEN PIN PYO SAF TRB 24D*
Mode of Action1 9 22 14 6 14 2 4 1 14 4 2 4 2 3 1 2 14 2 4
ANNUAL WEEDS
barnyardgrass C CNNNNN C2 PN PN — C C — — —N
bassia, fivehook C C — C — — C N — P — N — — N — — — C
foxtails (yellow and green) C CNNNNN C —N CN — C C P/C — —N
goosefoot, nettleleaf C C — C P C C N — — — C — C N C — — —
knotweed, prostrate P P CN — C CN — C C CN CN — C P C
kochia C N C C — P C N C P C P — — N — C P P
lambsquarters, common C C C C C C CN P C C C — CN C C C C
pigweed, redroot C C C P C C C N P C C C — C N C C C C
polypogon, rabbitfoot C —NNNNNN — — —N — CN — — —N
spurge, prostrate C C C P C C P N — — P P — C N — — — —
starthistle, yellow CN — C P C CN — — — C PNN — — — C
sunflowers C C C C P C C N — C C C — N N — — — C
thistle, Russian C P C C — C CN P C C P —NN C C P C
PERENNIAL WEEDS
bindweed, field (seedling) C P P P C — PN — P CN — PN — P — C
bindweed, field (mature) P N P N P — P N — P — N — N N — — — P
buttercup, crowfoot — P —N — — CN — — — P —NN — — — P
johnsongrass (seedling) C C N N N — N C — N C N — N — — — — N
johnsongrass (mature) CNNNN —NN —N —N —N — — — —N
nutsedge, yellow P N N N N N N N — — C N N N N — — — N
smartweed, pale C PNN — — PN P C — C — —N — — — C
C = control P = partial control N = no control — = no information
BRO = bromoxynil (Maestro 4EC) GLY = glyphosate (Roundup PowerMax) PYO = pyroxsulam (Simplicity CA)
CAR = carfentrazone (Shark EW) IMZ = imazamox (Beyond Xtra) PYR = pyraflufen-ethyl (ETX Herbicide/Defoliant)
CHS = chlorsulfuron (Glean XP) MCA = MCPA* (MCPA Amine 4) SAF = saflufenacil (Sharpen)
DIC = dicamba* (Clarity) MES = mesosulfuron (Osprey) TRB = tribenuron-methyl (Express Herbicide)
FEN = fenoxaprop (Puma 1EC) PAR = paraquat* (Gramoxone SL 3.0) 24D = 2,4-D Amine* (2,4-D Amine 4)
FLM = flumioxazin (Chateau EZ) PEN = pendimethalin (Prowl H20)    
FLR = fluroxypyr* (Cleansweep M) PIN = pinoxaden (Axial XL)    
*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.
2Resistance is known to occur.

Text Updated: 12/25

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