Skip to Main Content
CA.gov

Official website of the State of California

Help Translate
State of California Department of Pesticide Regulation
Custom Google Search
  • About
    • About DPR
    • Environmental Justice
    • Tribal Affairs
    • Committees
    • Laws and Regulations
    • Report a Pesticide Incident
  • Pesticide Safety
    • How Pesticides are Evaluated
    • Community Health
    • Worker Safety
    • Healthy Schools Act
    • Enforcement
    • Endangered Species
    • Cannabis Cultivation
    • Look Up Pesticide Info
    • Report a Pesticide Incident
  • SPM and IPM
    • Sustainable Pest Management/Integrated Pest Management Overview
    • Integrated Pest Management/Sustainable Pest Management Resources
    • Integrated Pest Management Grants
    • Integrated Pest Management Achievement Awards
  • Pesticide Registration
    • How to Register a Pesticide
    • Registered Products in California
    • Look Up Pesticide Info
    • Stakeholder Notices and Info
  • Professional Licensing
    • Apply or Renew a License
    • Continuing Education
    • List of Current Licensees
  • Data and Reports
    • Pesticide Use in California
    • Environmental Monitoring
    • Tracking Pesticide Illness
    • Residue Monitoring
    • Registered Products in California
    • Look Up Pesticide Info
    • Reports Directory
  • Get Involved with DPR
    • News and Announcements
    • Meetings and Events
    • Resource Hub for Local Engagement
    • Proposed Regulatory Changes
    • Submit a Public Comment
On this Page

Information on Difethialone

See all Active Ingredients

Find information on the registration status, continuous evaluation and mitigation measures in California to regulate this active ingredient. An active ingredient is the chemical that makes a pesticide work on a target pest.

Active Ingredient: Difethialone
Type of Pesticide: Rodenticide
California Registration: Yes
Products Registered
EPA Registration: Yes
Fumigant: No
California Restricted Material: Yes
Toxic Air Contaminant (TAC): No
Volatile Organic Compound (VOC): No
Potential Groundwater Contaminant: No
Reevaluation Status: Active
Chemical Class: Second-Generation Anticoagulant Rodenticide
DPR Chemical Code: 4014

Risk Evaluation and Mitigation Documents

  • Enforcement Letter 24-20: Chlorophacinone and Warfarin: Restricted material status, prohibitions, allowed uses, and questions and answers
  • October 2024 - Semiannual Report Summarizing the Reevaluation Status of Pesticide Products During the Period of January 1, 2024, Through June 30, 2024
  • October 2023 - Bill Text, Pesticides: Second Generation Anticoagulant Rodenticides: Diphacinone
  • October 2021 - Enforcement Letter 21-13: Second generation anticoagulant rodenticides - Revised law and updates to allowed uses
  • October 2021 - Bill Text, Pesticides: Use of 2nd Generation Anticoagulant Rodenticides
  • December 2020 - Enforcement Letter 20-20: New Second Generation Anticoagulant Rodenticide Prohibitions And Allowed Uses - Questions And Answers
  • September 2020 - Bill Text, Pesticides: Use of Second Generation Anticoagulant Rodenticides
  • March 2019 - Notice of Final Decision to Begin Reevaluation of Second-Generation Anticoagulant Rodenticides
  • December 2018 - Notice of Extension to the Public Comment Period Regarding the Proposed Decision to Begin Reevaluation of Second-Generation Anticoagulant Rodenticides
  • November 2018 - Notice of Proposed Decision to Begin Reevaluation of Second-Generation Anticoagulant Rodenticides and Public Report
  • November 2018 - DPR Letter to Michael Graf Regarding Reevaluation of Anticoagulant Rodenticides - English pdf  
  • November 2018 - Investigation of Anticoagulant Rodenticide Data - English pdf  
  • November 2018 - List of Products Included in Proposed Reevaluation - English pdf  
Resources
Mill Assessment Language Access Careers Contact Us CalEPA
Stay Informed
Get the latest updates from the California Department of Pesticide Regulation
CA.gov
  • Privacy Policy
  • Conditions of Use
  • Accessibility Guide
  • Accessibility Certification
  • Sitemap
  • Facebook
  • Twitter
  • YouTube
  • LinkedIn
Copyright © State of California