Exhibit E - Herbicide Classification.pdf
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Exhibit E Herbicide Classification
Herbicide Classification According to Movement and Mechanism of Action This Table Classifies Herbicides According To Their WSSA Group Number
Sample Herbicides Only, Does Not Imply Future Herbicide Use
Mechanism of Action Herbicide Movement WSSA Group Number Sample Herbicides acetyl CoA carboxylase (ACCase) inhibitors symplast 1 Clethodim acetolactate synthase (ALS) inhibitor symplast 2 Chlorsulfuron
Imazapyr
Imazipic
Metsulfuron-methyl microtubule inhibitors soil-applied 3 Pendimethalin
Prodiamine synthetic auxins symplast 4 2,4-D
Aminocyclopyrachlor
Aminopyralid
Dicamba
Picloram
Triclopyr photosystem II inhibitors apoplast 5, 6, 7 Chlorprocarb enolpyruvyl shikimate-3-phosphate (EPSP) synthase inhibitor symplast 9 Glyphosate glutamine synthetase inhibitor contact 10 Glufosinate-ammonium protoporphyrinogen oxidase (PPO or Protox) inhibitors contact 14 Saflufenacil
Flumioxazin long chain fatty acid inhibitor soil-applied 15 Pyroxasulfone auxin transport inhibitor symplast 19 Diflufenzopyr-sodium cellulose biosynthesis inhibitors soil-applied 21, 29 Indaziflam photosystem I inhibitors contact 22 Diquat
4-hydroxyphenylpyruvate dioxygenase (HPPD) inhibitor symplast 27 Topramezone
Adopted from “Turfgrass Weed Control for Professionals”, 2019 edition, Purdue University Extension and Weed Science Society of America – Herbicide Site of Action (SOA) Classification List, 12/2/2020
(https://wssa.net/wssa/weed/herbicides/)
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