Consultation on Special Review of Tetrachlorvinphos and Its Associated End-use Products, Proposed Special Review Decision PSRD2019-04

Notice to the reader:

This consultation is now closed.

Health Canada is consulting Canadians over the next 45 days on its proposed special review decision for tetrachlorvinphos. Tetrachlorvinphos is a pesticide used by commercial applicators and the general public to control insects such as lice, mites and ticks, on animals for food production (beef cattle, dairy cattle and poultry), companion animals (cats and dogs) and their bedding and living quarters, and in structures (for example, dairy barns, poultry houses and swine barns). Product names include Vet-Kem, Zodiac, Ultraguard, Incontrol, Debantic and Ectogard. For a full list please see Appendix I in the consultation document or visit the Pesticide Label Search results for tetrachlorvinphos.

This special review was conducted to assess potential human health concerns around occupational and residential exposure. Based on the outcome of the assessment, Health Canada is proposing to allow the following uses to continue with the addition of protective measures, described in detail in Appendix VIII.

Commercial class

  • Ear tag product
  • Wettable power product
  • Roost paint application to treat lice, mites, and lesser mealworms
  • Handheld spray application to poultry
  • Handheld spray application to poultry house floor management to treat lice, mites, and lesser meal-worms
  • Handheld spray application to poultry droppings, manure piles, garbage piles, and under feed troughs to treat maggots
  • Handheld spray application to livestock premises (1% and 2% dilution)

Domestic class

  • Flea and tick liquid (trigger spray) products

As the risks to human health are not considered to be acceptable, Health Canada is proposing to cancel the following uses of tetrachlorvinphos:

Commercial Class

  • Wettable powder product
  • Direct application as a wettable powder or dust to poultry and poultry facilities
  • Handheld spray application to poultry housing walls, ceilings, floor cracks and crevices to treat fowl ticks

Domestic Class

  • All flea and tick powder/dust products
  • All flea and tick pet collar products

For more information on the proposed decision open the “Proposed Special Review Decision”.

How to Get Involved

This consultation is open for comment from 26 April 2019 to 10 June 2019 (45 calendar days).

To comment on PSRD2019-04:

Step 1
Request the full consultation document to read the Science Evaluation that is the basis of this proposed regulatory decision.
Step 2
Submit comments to the PMRA Publications Section.

All comments received will be considered. A final special review decision will consider additional scientific information provided during the public comment period.

Please refer to the document title (for example: PSRD2019-04, Special Review of Tetrachlorvinphos and Its Associated End-use Products) when providing comments.

Reporting to Canadians

Health Canada will make the results of this consultation available on this website. Once the decision is finalized, the PMRA will post a Special Review Decision on the Pesticides and Pest Management Reports and Publications portion of

If you have any questions, contact the Pest Management Information Service.

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