Proposed Re-evaluation Decision PRVD2019-09, Uniconazole-P and Its Associated End-use Products

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Pest Management Regulatory Agency
7 August 2019
ISSN: 1925-0967 (PDF version)
Catalogue number: H113-27/2019-9E-PDF (PDF version)

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Table of Contents

Proposed Re-evaluation Decision

Under the authority of 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 standards and continue to have value. The re-evaluation considers data and information from pesticide manufacturers, published scientific reports, and other regulatory agencies. Health Canada applies internationally accepted risk assessment methods as well as current risk management approaches and policies.

Uniconazole-P is a plant growth regulator registered for use on greenhouse ornamentals and greenhouse tomato seedlings for transplant only.

This document (Proposed Re-evaluation Decision PRVD2019-09, Uniconazole-P and Its Associated End-use Products) presents the proposed regulatory decision for the re-evaluation of uniconazole-P including the proposed risk mitigation measures to further protect human health, as well as the science evaluation on which the proposed decision was based. All products containing uniconazole-P registered in Canada are subject to this proposed re-evaluation decision. PRVD2019-09 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. The final re-evaluation decision will be published taking into consideration the comments and information received.

Outcome of Science Evaluation

Uniconazole-P is used in the greenhouse ornamental industry and tomato transplant seedling production in greenhouses. It is widely used on economically important ornamentals to enhance aesthetic appearance through producing more desirable, compact, and marketable crops.

With respect to human health, dietary risks and risks to workers from most uses are considered to be acceptable under the current conditions of use. However, risks are not considered to be acceptable for workers conducting postapplication activities for greenhouse ornamentals grown for cut flowers. Therefore, the use on greenhouse ornamentals grown for cut flowers is proposed for cancellation. In addition, label updates are proposed to meet the current labelling standard and to improve clarity.

When used according to the current label directions of products containing uniconazole-P, risks to the environment are considered to be acceptable.

Proposed Regulatory Decision for Uniconazole-P

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 uniconazole-P are acceptable for continued registration in Canada, provided that the additional proposed risk mitigation measures are in place.

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 uniconazole-P, further risk mitigation measures for product labels are being proposed.

Proposed Risk Mitigation Measures

The updated label statements and mitigation measures required, as a result of the re-evaluation of uniconazole, are summarized below. Refer to Appendix VIII of PRVD2019-09 for details.

Human Health

To protect workers, the following risk mitigation measures are proposed:

International Context

Uniconazole-P is currently acceptable for use in other Organisation for Economic Co-operation and Development (OECD) member countries, including the United States, Australia and New Zealand. No decision by an OECD member country to prohibit all uses of uniconazole-P for health or environmental reasons has been identified.

Next Steps

The public, including the registrants and stakeholders, can submit additional information that could be used to refine risk assessments during the 90-day public consultation periodFootnote 1 upon publication of PRVD2019-09.

All comments received during the 90-day public consultation period will be taken into consideration in preparation of re-evaluation decision document.Footnote 2 The re-evaluation decision document will include the final re-evaluation decision, the reasons for it, and a summary of comments received on the proposed re-evaluation decision along with the PMRA's responses.


Footnote 1

"Consultation statement" as required by subsection 28(2) of the Pest Control Products Act.

Return to footnote 1 referrer

Footnote 2

"Decision statement" as required by subsection 28(5) of the Pest Control Products Act.

Return to footnote 2 referrer

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