Consultation on the special review of chlorothalonil and its associated end-use products, Proposed Special Review Decision PSRD2022-01

Notice to the reader:

The online consultation is now closed.

Health Canada is consulting Canadians over the next 45 days on its proposed special review decision to continue registration of greenhouse ornamental uses of chlorothalonil and associated end-use products registered for sale and use in Canada. All other uses of chlorothalonil are proposed for cancellation since potential risks to human health and the environment were not shown to be acceptable.

Health Canada has evaluated the aspects of concern that prompted the special review of pest control products containing chlorothalonil. The aspects of concern for this special review are relevant to human health and the environment.

Chlorothalonil is a contact and protectant fungicide with a multi-site mode of action. It controls a broad range of fungal diseases on a large number of field and orchard crops, conifers, greenhouse celery seedbeds, greenhouse ornamentals, outdoor ornamentals, mushroom houses, and turf. Chlorothalonil is also used as a dry-film material preservative agent against bacterial and fungi contamination or spoilage of paint and is currently under re-evaluation in Canada. This use is not part of the scope of this special review.

With respect to human health, dietary risks (food alone and food plus water) were not shown to be acceptable for food uses when chlorothalonil is used according to current conditions of registration. Environmental risks to aquatic organisms were not shown to be acceptable for all outdoor uses when chlorothalonil is used according to current conditions of registration. However, environmental risks to aquatic organisms from mushroom houses and greenhouse uses were shown to be acceptable with proposed risk mitigation.

For a list of products containing chlorothalonil in Canada, please consult Appendix I in the PSRD or visit the Pesticide Label Search database.

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

How to Get Involved

This consultation is open for comment from 10 February 2022 to 27 March 2022 (45 calendar days).

To comment on PSRD2022-01:

All comments and information received during the public comment period will be considered before making a final special review decision.

Please refer to the document title (for example: PSRD2022-01, Special Review of Chlorothalonil and Its Associated End-use Products: Proposed Decision for Consultation) 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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