Consultation on Quizalofop-p-ethyl and Its Associated End-use Products, Proposed Re-evaluation Decision PRVD2022-17 

Health Canada is consulting Canadians on the proposal to continue registration of quizalofop-p-ethyl and all associated end-use products registered for sale and use in Canada, provided new risk mitigation measures are put in place.

Quizalofop-p-ethyl is a selective systemic, grass-controlling herbicide registered for postemergent control of annual and perennial grass weeds in a variety of crops such as major field crops, cucurbit vegetables, horticultural crops, forage crops for seed production and many minor specialty crops including industrial hemp grown for fibre, seed and oil. It is applied using ground or aerial equipment.

Potential risks to human health were shown to be acceptable when quizalofop-p-ethyl is used according to the proposed updated conditions of registration such as updates to personal protective equipment for mixers, loaders and applicators, standard restricted-entry intervals, re-treatment and preharvest intervals, and a best practice label statement to minimize the potential for spray drift.

The environmental risk assessment found that potential risks to the environment associated with the use of quizalofop-p-ethyl were shown to be acceptable when used according to proposed conditions of registration, which includes new mitigation measures, such as precautionary statements, and spray buffer zones for the protection of terrestrial and aquatic habitats.

Quizalofop-p-ethyl has value in providing effective control of perennial grass weeds and it is the only herbicide registered for use on hemp and Ethiopian mustard.

For a full list of products containing quizalofop-p-ethyl, please consult Appendix I in the Proposed Re-evaluation Decision or visit the Pesticide Label Search database.

For more information on the proposed decision open the "Proposed Re-evaluation Decision".

How to get involved

This consultation is open for comment from 29 July 2022 to 27 October 2022 (90 calendar days).

To comment on PRVD2022-17:

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 re-evaluation decision will consider additional scientific information provided during the public comment period.

Please refer to the document title (for example: PRVD2022-17, Quizalofop-p-ethyl 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 Re-evaluation 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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