Skip to main content

What is IR-4?

Interregional Research Project No. 4 (IR-4 Project). IR-4 is the "minor use pesticides" program. It is a federal cooperative program established in 1963 to help the producers of minor crops obtain clearances for pest control materials on minor crops. The purpose of IR-4 is to work with farmers, agriculture scientists and Extension personnel to carry out research and petition the Environmental Protection Agency (EPA) in order to obtain tolerances for specific pesticide uses needed by minor crop producers.


IR-4 is the principal public effort to gain EPA-approved tolerances for safe and effective pest control products on specialty food crops such as fruits, vegetables, herbs, and others. IR-4 also develops data to assist in the registration of pest control tools for floral, forestry, nursery and turf crops. With funding and support from USDA (both CSREES and ARS), and State Agricultural Experiment Stations, IR-4 coordinates a grass roots effort to provide pest control product alternatives compatible with minor crop integrated pest management programs.


IR-4 carries out the research needed for the registration or "clearance" of pest control materials on minor crops. IR-4 prepares and submits petitions to the EPA requesting tolerances or exemptions for pest control products on minor crops. The Program is closely coordinated from a Headquarters located at the New Jersey Agricultural Experiment Station in New Brunswick, NJ. The agrichemical industry, crop producers and the EPA all participate in the program.


The IR-4 Liaison Representative for Oklahoma  is Charles Luper in the Entomology and Plant Pathology Department. Supporting participants at Oklahoma State University include Drs. John Damicone, Plant Pathologist, Lynn Brandenburger, Horticulturist and Weed Specialist, and Jonathon Edelson, Entomologist. 


IR-4 Links

  • Regional Website
    • Southern Region Pesticide Coordinators - This site provides links to the Extension pesticide program sites (PAT & Pesticide education, NAPIAP, IR-4) and state pesticide regulatory agencies for USDA Southern Region states (includes EPA Region 4 and part of EPA Regions 3, 6). This page also links to associated EPA and USDA web sites. This site is maintained by the Virginia Tech Pesticide Programs for the Region.
  • National Websites
    • Interregional Project 4 (IR-4) - This is the National Program site located at Rutgers University.
    • EPA New Approaches to Minor Uses - Information on the Agency's minor use activities and partnerships with other agencies. From this site you can get a copy of EPA's Report on Minor Use Pesticides.
    • Fedstats - The Federal Interagency Council on Statistical Policy maintains this site to provide easy access to the full range of statistics and information produced by more than 70 agencies in the United States federal government. Produced are statistics of interest to the public and for public use. Has links to other statistics sites.
    • NASS - USDA National Agricultural Statistics Service
    • National Center for Food and Agricultural Policy - Articles by Leonard P. Gianessi
    • Food and Feed Commodity Vocabulary - The Food and Feed Commodity Vocabulary was developed to consolidate all the major Office of Pesticide Program Commodity Vocabularies into one standardized vocabulary. The Food and Feed Commodity Vocabulary contains only human consumable commodities and livestock feeds.
    • Food Quality Protection Act (FQPA) - A primary consideration in implementation of the Food Quality Safety Act (FQPA) safety factor provision is assessing the degree of concern regarding the potential for pre- and postnatal effects.
Back To Top