The information in this profile may be out-of-date.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 fonofos include Capfos, Cudgel, Difonate, Dyfonate, Dyphonate, and Stauffer N 2790.

Regulatory Status: Fonofos is a highly toxic organophosphate insecticide in EPA toxicity class I. Labels for products containing it must bear the Signal Words DANGER - POISON. Some or all formulations of fonofos are classified as Restricted Use Pesticides (RUPs) by the EPA. RUPs may be purchased and used only by certified applicators.

Chemical Class: organophosphate

Introduction: Fonofos is a soil organophosphate insecticide primarily used on corn. It is also used on sugar cane, peanuts, tobacco, turf, and some vegetable crops. It controls aphids, corn borer, corn rootworm, corn wireworm, cutworms, white grubs, and some maggots. It is available in granular, microgranular, emusifiable concentrate, suspension concentrate, microcapsule suspension, and seed treatment.

Formulation: It is available in granular, microgranular, emulsifiable concentrate, suspension concentrate, microcapsule suspension, and seed treatment formulations.

Toxicological Effects:

Ecological Effects:

Environmental Fate:

Physical Properties:

Exposure Guidelines:

Basic Manufacturer:

Zeneca Ag Products
1800 Concord Pike
Wilmington, DE 19897


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.