The information in this profile may be out-of-date.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


Trade and Other Names: Trade names for trichlorfon include Anthon, Bovinos, Briten, Chlorophos, Ciclosom, Dipterex, Ditrifon, Dylox, Dyrex, Equino-Aid, Foschlor, Leivasom, Neguvon, Masoten, Pronto, Phoschlor, Proxol, Totalene, Trichlorophene, Trichlorophon, Trinex, Tugon and Vermicide Bayer 2349. The common name used in Great Britain is trichlorphon, in Turkey is dipterex, and in the former U.S.S.R. is chlorofos. When this material is used as a drug, it is called metrifonate or metriphonate.

Regulatory Status: Trichlorfon is classified by the U.S. Environmental Protection Agency (EPA) as a General Use Pesticide (GUP). It is in toxicity class II - moderately toxic. Products containing trichlorfon bear the Signal Word WARNING.

Chemical Class: organophosphate

Introduction: Trichlorfon is an organophosphate insecticide used to control cockroaches, crickets, silverfish, bedbugs, fleas, cattle grubs, flies, ticks, leafminers, and leaf-hoppers. It is applied to vegetable, fruit, and field crops; livestock; ornamental and forestry plantings; in agricultural premises and domestic settings; in greenhouses, and for control of parasites of fish in designated aquatic environments. It is also used for treating domestic animals for control of internal parasites [2,6]. Trichlorfon is available in dust, emulsifiable concentrate, granular, fly bait, and soluble powder formulations with percent active ingredient ranging from 40% (soluble powder) to 98% (technical). Trichlorfon is a selective insecticide, meaning that it kills selected insects, but spares many or most other organisms. Trichlorfon is toxic to target insects through direct applications and via ingestion.

Formulation: Trichlorfon is available in dust, emulsifiable concentrate, granular, fly bait, and soluble powder formulations with percent active ingredient ranging from 40 (soluble powder) to 98% (technical).

Toxicological Effects:

Ecological Effects:

Environmental Fate:

Physical Properties:

Exposure Guidelines:

Basic Manufacturer:

Miles, Inc.
8400 Hawthorn Road
P.O. Box 4913
Kansas City, MO 64120


References for the information in this PIP can be found in Reference List Number 5

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.