Proposed Re-evaluation Decision PRVD2018-14, Chlorimuron-ethyl and Its Associated End-use Products

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This consultation is now closed.

Pest Management Regulatory Agency
10 July 2018
ISSN: 1925-0967 (PDF version)
Catalogue number: H113-27/2018-14E-PDF (PDF version)

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Table of Contents

Proposed Re-evaluation Decision

Under the Pest Control Products Act, all registered pesticides must be regularly re-evaluated by Health Canada’s Pest Management Regulatory Agency (PMRA) to ensure that they continue to meet current health and environmental safety standards and continue to have value. The re-evaluation considers data and information from pesticide manufacturers, published scientific reports, and other regulatory agencies. The PMRA applies internationally accepted risk assessment methods as well as current risk management approaches and policies.

Chlorimuron-ethyl is a commercial herbicide registered for use on soybeans in Eastern Canada for the control of broadleaf weeds.

This document (Proposed Re-evaluation Decision PRVD2018-14, Chlorimuron-ethyl and Its Associated End-use Products) presents the proposed regulatory decision for the re-evaluation of chlorimuron-ethyl including proposed risk mitigation measures to further protect human health and the environment, as well as the science evaluation on which the proposed decision was based. All products containing chlorimuron-ethyl registered in Canada are subject to this proposed re-evaluation decision. Proposed Re-evaluation Decision PRVD2018-14, Chlorimuron-ethyl and Its Associated End-use Products is subject to a 90-day public consultation period, during which the public, including the pesticide manufacturers and stakeholders, may submit written comments and additional information to the PMRA Publication Section. The final re-evaluation decision will be published taking into consideration the comments and information received.

Outcome of Science Evaluation

Dietary risks from food and drinking water are not of concern when products containing chlorimuron-ethyl are used according to label directions. Canadian MRLs for chlorimuron-ethyl are currently specified for soybeans and no changes are proposed.

Occupational risks to handlers and postapplication risks are not of concern when chlorimuron-ethyl is used according to label directions. To protect workers entering treated sites a restricted‑entry interval (REI) of 12 hours is proposed for agricultural uses.

Chlorimuron-ethyl is not expected to pose risks of concern to the environment when used according to the proposed label directions, which include advisory statements and spray buffer zones.

Proposed Regulatory Decision for Chlorimuron-ethyl

Under the authority of the Pest Control Products Act and based on the evaluation of currently available scientific information, Health Canada is proposing that products containing chlorimuron-ethyl are acceptable for continued registration in Canada, provided that the proposed risk mitigation measures are implemented. No uses are proposed for cancellation.

Registered pesticide product labels include specific directions for use. Directions include risk mitigation measures to protect human health and the environment that must be followed by law. As a result of the re-evaluation of chlorimuron-ethyl, further risk mitigation measures as summarized below for product labels are being proposed.

Human Health

  • To protect workers entering treated sites a standard REI of 12 hours is proposed for agricultural uses.
  • To protect bystanders, a standard statement is proposed indicating to apply only when the potential for drift is minimal to areas of human habitation or areas of human activity such as houses, cottages, schools and recreational areas.


  • Updated spray buffer zones ranging from 1 to 20 meters to mitigate the impact on sensitive non-target terrestrial and aquatic habitats.
  • Standard environmental precautionary label statements to protect non-target terrestrial plants and freshwater plants and algae
  • An advisory label statement to reduce run-off potential.

International Context

Chlorimuron-ethyl is currently acceptable for use in other Organisation for Economic Cooperation and Development (OECD) member countries, including Japan, New Zealand, and the United States. As of 24 October 2017, no decision by an OECD member country to prohibit all uses of chlorimuron-ethyl for health or environmental reasons has been identified.

Next Steps

The public, including manufacturers and stakeholders, are encouraged to submit comments during the 90-day public consultation period.

All comments received during the public consultation period will be taken into consideration in preparation of the re-evaluation decision document. The re-evaluation decision document will include final re-evaluation decision, the reasons for it and a summary of comments received on the proposed re-evaluation decision with the PMRA’s responses.

Additional Scientific Information

No additional data are required.

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