Herbicide Damage: Dichlobenil (Casoron)

Photo by: R. Maleike
Use IPM (Integrated Pest Management) for successful plant problem management.

Dichlobenil is a soil-applied herbicide which inhibits root development and prevents germination and establishment of weed seedlings. While dichlobenil is not translocated in the plant, symptoms resulting from inhibited root growth may appear on aboveground portions of the plant. The primary aboveground symptom of damage is chlorosis. On broad-leaved plants this can be tip, marginal, or interveinal yellowing, or can appear as overall yellowing of the leaf. On conifers, excessive dichlobenil applications can cause tip chlorosis tending toward tip necrosis. Symptoms usually appear on the new growth. The damage may occur on those leaves and leaf parts that orient toward the afternoon sun. Dichlobenil damage closely resembles triazine/simazine damage. This herbicide is persistent in the soil and decomposes slowly.

Management Options

Select Non-chemical Management Options as Your First Choice!!
Revision Date:5/1/2013
Carefully read all label instructions prior to using products containing dichlobenil.

Hortsense web site created by Carrie Foss, Pesticide Education, and Art Antonelli, Extension Entomology, WSU Puyallup
Pesticide information review provided by Catherine Daniels, Washington State Pest Management Resource Service
Database programs developed for Hortsense by Kathleen Duncan, Computer Resources, WSU Pullman
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