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

Susceptibility of Weeds to Herbicide Control

Weeds Pages

FALL BED PREPLANT POSTPLANT LAYBY
Preemergence Postemergence Preemergence Preemergence Postemergence Preemergence
MTR CAR GLY PAR* 13D/ MEO MEP* MET* NAP PEN TRI MEO RIM CAR CLE HAL MTR RIM SET EPT MEO PEN TRI
CHL*
Mode of Action1 5 14 9 22 – 15 – – 15 3 3 15 2 14 1 2 5 2 1 8 15 3 3
ANNUAL WEEDS: Broadleaves
Broomrape N — C N — — — C N — P — — — N N N — N N — — P
Chickweed, Common C P C C C C C C C C C C C P N C C C N C C C C
Dodders N P C C — N — C N P N N N P N P N P N P N P N
Fleabane, Hairy N N C C — N — C N N N N — N N — P — N P N N N
Goosefoot, Nettleleaf C — C C C P C C C C C P P — N C C P N C P C C
Groundcherries P C C C — C C C N N N C C C N — P P N C C N N
Groundsel, Common P — C C C N C C C N N N C — N C C P N C N N N
Horseweed — N C C — N — C N N N N — N N — C — N P N N N
Jimsonweed N — C C — — — C N N N — — — N — N — N C — N N
Knotweed, Prostrate N — C P — N — C C C C N C — N — P P N P N C C
Lambsquarters, Common C — C P C P C C C C C P C — N P C P N C P C C
Lettuce, Prickly C — C C — N C C C N N N P — N N P P N C N N N
Mallow, Little (Cheeseweed) P C P P P P P N C P N P C C N — P P N P P P N
Mustards C P C C — N C C P P N N C P N C C C N N N P N
Nettle, Burning C C N C C C C C P N P — C C N C C C N P — N P
Nightshade, Hairy P C C C — C C C N P N C C C N N P P N C C P N
Nightshade, Black N C C C — C C P N P N C C C N N P P N P C P N
Pigweeds C C C C C C C C C C C C C C N C C P N C C C C
Purslane, Common P N C C C C C C C C C C C N N P P C N C C C C
Rocket, London C C C C — N C C P P N N C C N C C C N P N P N
Shepherd's-Purse C P C C — P C C P P N P C P N P C C N P P P N
Sowthistles C N C C C P C C C N N P P N N C C P N C P N N
Sweetclovers C — C P N N P N P N P — — — N — P N N N — N N
Thistle, Russian C — C P — P P C P P C P P — N — P P N N P P C
Tobacco, Indian — — C C — — — C N N N — — — N — N — N C — N N
Velvetleaf P C C C — P P C N N N P P C N C C P N P P N N
ANNUAL WEEDS: Grasses
Barnyardgrass P N C C C C C C C C C C C N C N P C C C C C C
Canarygrasses — N C C — C C C C C C C — N C N N — C C C C C
Cereals, Volunteer P N C C C N C C C C N N C N C N N C C C N P N
Crabgrass, Large C N C C — C C C C C C C P N C N N C C C C C C
Lovegrasses P N C C — C C C C C C C P N C N N P C C C C C
Oat, Wild P N C P — N C C C P N N P N C N N P C C N P C
PERENNIAL WEEDS: Seedlings
Bermudagrass N N C C C N C C C C N N N N C N N — C C N C C
Bindweed, Field N C C C N N N C N N N P N C N N N P N — P N C
Johnsongrass N N C C — C — C P C C C P N C N N P C C C C C
PERENNIAL WEEDS: Established
Bermudagrass N N C N T N T P N N N N N N P N N N P N N N N
Bindweed, Field N P C N N N T P N N N — P P N — N P N N — N N
Datura, Sacred N — C P — — — N N N N — — — — N P — N P — N N
Johnsongrass N N P N — N N P N N N N N N P N N N C C N N N
Nutsedge, Purple N N P N — N P N N N N N P N N C N N N C N N N
Nutsedge, Yellow P N P N P P P P P N N P P N N P N N N C P N N

C = control P = partial control N = no control T = top kill only — = no information

13D/CHL = 1,3-dichloropropene/chloropicrin* (Telone) — MET = metam sodium* (Vapam, etc.) —
CAR = carfentrazone (Shark) 14 MTR = metribuzin (Metribuzin 75, etc.) 5
CLE = clethodim (Select Max) 1 NAP = napropamide (Devrinol) 15
EPT = EPTC (Eptam) 8 PAR = paraquat* (Gramoxone) 22
GLY = glyphosate (Roundup, Touchdown) 9 PEN = pendimethalin (Prowl H20) 3
HAL = halosulfuron (Sandea) 2 RIM = rimsulfuron (Matrix) 2
MEO = s-metolachlor (Dual Magnum) 15 SET = sethoxydim (Poast) 1
MEP = metam potassium* (K-Pam HL) — TRI = trifluralin (Treflan) 3

* 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: 11/11
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