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IPM - Herbicide Classification by Mode of Action
2/2/01
Table of Contents

Author: Ron Ritter, University of Maryland

Herbicide Classification by Mode of Action

Inhibit photosynthetic electron transport

Triazines

Inhibit photosynthetic electron transport

Phenylureas

Inhibit photosynthetic electron transport

Uracils

Inhibit photosynthetic electron transport

Diazinones

Inhibit photosynthetic electron transport

Bipyridyliums

Inhibit photosynthetic electron transport

Benzonitriles

Inhibit amino acid biosynthesis (ALS)—Imi’s

Imidazolinones (Imi’s)

Inhibit amino acid biosynthesis (ALS)—SU’s

Sulfonylureas (SU’s)

Sulfonylureas (SU’s) cont.

Inhibit amino acid biosynthesis (ALS)—SU’s

Inhibit amino acid biosynthesis (ALS)—SU’s

Inhibit amino acid biosynthesis (ALS)

Sulfonamides

Inhibit amino acid biosynthesis

Phosphono amino acid derivatives

Inhibit protporphyringen oxidase (PPO’S)

PPO’s

Inhibit lipid biosynthesis (ACCase Inhibitors)

ACCase Inhibitors

Act as growth regulators

Growth Regulators: Oldest compounds

Act as a growth regulator

Inhibit carotenoid biosynthesis (Pigment inhibitors)

Pigment inhibitors

Inhibit seedling growth (Shoot inhibitors)

Shoot inhibitors (Chloroacetamides)

Inhibit seedling growth (Shoot inhibitors)

Shoot inhibitors (Thiocarbamates)

Inhibit seedling growth (Root inhibitors – DNA’s)

Root inhibitors (Dinitroanalines)
University of Delaware Cooperative Extension