University of California
Herbicide Symptoms

Cellulose Inhibitors (Cell Wall Synthesis)

HRAC Group: L

WSSA Group: 20, 21, 26, 29

Herbicides in this group prevent cell division primarily in developing root tips and are only effective on some germinating broadleaves and selected grasses. Alkylazine, benzamides, and nitriles are Cellulose Inhibitor herbicides that affect cell wall biosynthesis (cellulose) in susceptible plants causing inhibition of cell division.

Injury symptoms: Symptoms on grass species include short, swollen coleoptiles. Injured broadleaf plants often have swollen hypocotyls. Consequently, the plants may be stunted. Seeds of treated broadleaved plants germinate, but they either fail to emerge or emerge as severely stunted seedlings.  In trees or woody ornamental, dichlobenil may cause chlorosis, necrosis, leaf crinkling, leaf distortion, purpling of the leaf, and stunting. In the case of dichlobenil (droplet or vapor) drift, leaves may appear bleached or yellow.

Chemistry Group and Common Names of Cell Wall Synthesis Inhibitors
Used in the United States

Chemistry Common Name
Alkylazine Indaziflam
Benzamide Isoxaben
Nitrile Dichlobenil


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