The information in this profile may be out-of-date. It was last revised in 1996. EXTOXNET no longer updates this information, but it may be useful as a reference or resource.

Please visit the National Pesticide Information Center (NPIC) to find updated pesticide fact sheets. If you don't find a fact sheet related to your question, feel free to call 1-800-858-7378. NPIC is open five days a week from 8:00am to 12:00pm Pacific Time.


Extension Toxicology Network

Pesticide Information Profiles

A Pesticide Information Project of Cooperative Extension Offices of Cornell University, Oregon State University, the University of Idaho, and the University of California at Davis and the Institute for Environmental Toxicology, Michigan State University. Major support and funding was provided by the USDA/Extension Service/National Agricultural Pesticide Impact Assessment Program.

EXTOXNET primary files maintained and archived at Oregon State University

Revised June 1996

DCPA, Chlorthal, Clorthal-dimethyl

Trade and Other Names: DCPA is also called chlorthal or chlorthal-dimethyl. Trade names for products containing DCPA include DAC 893, Dacthal, and Dacthalor. It may be formulated with other herbicides such as methazole and propachlor.

Regulatory Status: DCPA is classified as a General Use Pesticide (GUP). The U.S. EPA classifies it as toxicity class IV - practically nontoxic. Products containing DCPA bear the Signal Word CAUTION. Its only restrictions apply in Washington State which requires supplemental labeling for Dacthal W-75.

Chemical Class: phthalate compound

Introduction: DCPA is a phthalate pre-emergent herbicide used on annual grasses and annual broadleaf weed species in a wide range of vegetable crops. About 20% of the use of this compound in the U.S. is for homes and gardens. Products containing DCPA may be formulated as wettable powders, granules, or as suspension concentrates.

While there is no toxicological concern for DCPA per se, the technical product DCPA may contain very small amounts of dioxin (2,3,7,8, TCDD) and Hexachlorobenzene (HCB) as impurities, which may be of toxicological concern.

Formulation: Products containing DCPA may be formulated as wettable powders, granules, or as suspension concentrates.

Toxicological Effects:

Ecological Effects:

Environmental Fate:

Physical Properties:

Exposure Guidelines:

Basic Manufacturer:

ISK Biosciences
5966 Heisley Road
P.O. Box 8000
Mentor, OH 44061-8000


References for the information in this PIP can be found in Reference List Number 7

DISCLAIMER: The information in this profile does not in any way replace or supersede the information on the pesticide product labeling or other regulatory requirements. Please refer to the pesticide product labeling.