The information in this profile may be out-of-date.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: Common names include azinphos-methyl and metiltriazotion. Trade names include Azimil, Bay 9027, Bay 17147, Carfene, Cotnion-methyl, Gusathion, Gusathion-M, Guthion, and Methyl-Guthion.

Regulatory Status: All azinphos-methyl liquids with a concentration greater than 13.5% are classified as Restricted Use Pesticides (RUP) by the U.S. Environmental Protection Agency (EPA) because of the inhalation hazard and acute toxicity they present, as well as their potential adverse effects on mammalian species, birds, and aquatic organisms. RUPs may be purchased and used only by certified applicators. The EPA has imposed a 24-hour reentry interval for this material. It is toxicity class I - highly toxic. Products containing azinphos-methyl bear the Signal Words DANGER and POISON.

Chemical Class: OP insecticide

Introduction: Azinphos-methyl is a highly persistent, broad spectrum insecticide. It is also toxic to mites and ticks, and poisonous to snails and slugs. It is a member of the organophosphate class of chemicals. It is nonsystemic, meaning that it is not transported from one plant part to another. It is used primarily as a foliar application against leaf feeding insects. It works as both a contact insecticide and a stomach poison. Azinphos-methyl is registered for use in the control of many insect pests on a wide variety of fruit, vegetable, nut, and field crops, as well as on ornamentals, tobacco, and forest and shade trees. Outside of the U.S., azinphos-methyl is used in lowland rice production. Azinphos-methyl is available in emulsifiable liquid, liquid flowable, ULV liquid, and wettable powder formulations.

Formulation: Azinphos-methyl is available in emulsifiable liquid, liquid flowable, ULV liquid, and wettable powder formulations.

Toxicological Effects:

Ecological Effects:

Environmental Fate:

Physical Properties:

Exposure Guidelines:

Basic Manufacturer:

Miles, Inc.
P.O. Box 4913
8400 Hawthorn Road
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.