Herbicide MOA, SOA, PRE/POST, and Broadleaf/Grass

Triazines (Group 5)

MOA: PSII inhibition 

SOA: D1 Protein

Broadleaf control (and some grasses)

PRE and POST

(Xylem translocation only)

Pyridiniums (Group 22)

MOA: PSI electron diversion

SOA: PSI

POST

Broadleaf and Grass

(Foliar activity)

Diphenyl ethers (Group 14)

MOA: Inhibition of PPO

SOA: PPO

Primarily PRE (sometimes POST but not very good)

Broadleaf control (causes injury to grass)

(foliar applied with some soil)

“Burns everything kills nothing”

Glufosinate (Group 10)

MOA: Inhibition of GS

SOA: Glutamine synthetase

Primarily POST (sometimes PRE)

Broadleaf and Grass

Triketones (Group 27)

MOA: Inhibition of pigment synthesis

SOA: HPPD

PRE and POST

Primarily Broadleaf (some grass activity)

Phenoxycarboxylates (Group 4)

MOA: Auxin mimics

SOA: Auxin receptors

PRE and POST

Broadleaf control only (primarily foliar)

(used in turfgrass weed control a lot)

SUs and IMIs (Group 2)

MOA: Inhibition of amino acid synthesis

SOA: ALS

PRE and POST

Broadleaf and Grass control

Glyphosate (Group 9)

MOA: Inhibition of amino acid synthesis

SOA: EPSPS

POST

Broadleaf and Grasses

(Foliar activity only)

Fops and Dims (Group 1)

MOA: Inhibition fo fatty acid synthesis

SOA: ACCase

POST

Grass control only

Chloroacetamides (Group 15)

MOA: Inhibition of fatty acid synthesis

SOA: VLCFA synthases

PRE

Grasses and some small seeded broadleaves

(Xylem mobile only)

Dinitroanilines (Group 3)

MOA: Blocks cell division

SOA: Tubulin

PRE

Grasses and small seeded broadleaves