Re-evaluation Decision RVD2018-20, Metiram and Its Associated End-use Products

Pest Management Regulatory Agency
21 June 2018
ISSN: 1925-1025 (PDF version)
Catalogue number: H113-28/2018-20E-PDF (PDF version)

This page is a summary of the decision document.

To obtain a full copy of Re-evaluation Decision RVD2018-20, Metiram and Its Associated End-use Products, please contact our publications office.

Should you require further information please contact the Pest Management Information Service.


Table of Contents

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 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.

Metiram is a protectant, contact fungicide with multi-site mode of action used in agriculture on a number of food crops. Three products containing metiram are currently registered in Canada under the authority of the Pest Control Products Act, including one technical grade active ingredient and two commercial class end-use products. Currently registered products containing metiram are listed in Appendix I.

This document (Re-evaluation Decision RVD2018-20, Metiram and Its Associated End-use Products) presents the re-evaluation decisionFootnote 1 for metiram. All products containing metiram that are registered in Canada are subject to this re-evaluation decision.

This re-evaluation decision was consulted on as Proposed Re-evaluation Decision PRVD2014-03, Metiram.Footnote 2 The 90-day consultation period ended on 18 September 2014. The PMRA received comments and new data/information relating to the health, value and environmental risk assessments. These comments and new data/information resulted in revisions to some parts of the risk assessments (see the Science Evaluation Update of RVD2018-20) and subsequent changes to the proposed regulatory decision as described in PRVD2014-03. Appendix II of RVD2018-20 summarizes the comments received and provides the PMRA's response.

Regulatory Decision for Metiram

The PMRA has completed the re-evaluation of metiram. Under the authority of the Pest Control Products Act, the PMRA has found the continued registration of products containing metiram acceptable for foliar application to potatoes. An evaluation of available scientific information found that the foliar application of metiram to potatoes meets current standards for protection of human health and the environment, when used according to the conditions of registration which include required amendments to label directions. All other uses of metiram are being cancelled due to unacceptable risks to human health and will be removed from the labels. Label amendments, as summarized below and listed in Appendix III of RVD2018-20, are required for all end-use products.

Risk Mitigation Measures

Registered pesticide product labels include specific instructions for use. Directions include risk reduction measures to protect human health and the environment. These directions must be followed by law. The key risk-reduction measures required are summarized below. Refer to Appendix III of RVD2018-20 for details.

Human Health

To protect the general population, the following risk-reduction measures are required for continued registration of metiram in Canada:

  • Cancel all Canadian uses for metiram with the exception of foliar application to potatoes.
  • Permit a maximum of 3 applications per year on potatoes, at a maximum application rate of 1.40 kg a.i./ha with 7-day application intervals, and a 14-day pre-harvest interval using aerial or ground spray only.

To protect mixer/loader/applicators:

  • Engineering controls: Closed mixing and loading (water soluble packaging), and a respirator with an open cab for groundboom application or closed cab application.
  • Additional layer of personal protective equipment: Coveralls over a long-sleeved shirt, and long pants, and chemical-resistant gloves.

To protect postapplication workers:

  • Restricted-entry intervals (REI): Depending on the activity, lengthened REIs are required.

To reduce potential exposure to ethylene thiourea (ETU) from use of multiple ethylenebisdithiocarbamate (EBDC) pesticides:

  • Limit applications of both mancozeb and metiram on potatoes during the same growing season.

Metiram does not present unacceptable risk to human health when used according to the revised conditions of registration, which include mitigation measures and label amendments. Label amendments are required for all end-use products and are listed in Appendix III of RVD2018-20.


To protect the environment, the following risk-reduction measures are required for continued registration of metiram in Canada

  • Spray buffer zones to protect non-target habitats from pesticide spray drift.
  • Standard runoff reduction statement on product labels.
  • Hazard statements on product labels warning of the potential to contaminate groundwater through leaching.
  • Warnings on product labels regarding toxicity of metiram to aquatic organisms; birds; small, mammals; certain beneficial insects; and terrestrial plants.

Next Steps

To comply with this decision, the required mitigation measures and removal of all but the potato foliar use must be implemented on all product labels sold by registrants no later than 24 months after the publication date of RVD2018-20.

Other Information

Any person may file a notice of objectionFootnote 3 regarding this decision on metiram within 60 days from the date of publication of RVD2018-20. For more information regarding the basis for objecting (which must be based on scientific grounds), please refer to the Pesticides section of (Request a Reconsideration of Decision) or contact the PMRA's Pest Management Information Service.

Appendix I Products Containing Metiram that are Registered in Canada as of 6 February 2018

Table 1 Products Containing Metiram that are Registered in CanadaTable 1 footnote 1 as of 6 February 2018
Registration Number Marketing Class Registrant Product Name Formulation Type Guarantee
20084 Technical BASF Canada Inc. TECHNICAL METIRAM (POLYRAM) Solid Metiram 89%
20087 Commercial POLYRAM DF WATER DISPERSIBLE GRANULAR FUNGICIDE Wettable Granules Metiram 80%
30395 Commercial CABRIO PLUS Wettable Granules Pyraclostrobin 5.00%; Metiram 55%


Footnote 1

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

Return to footnote 1 referrer

Footnote 2

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

Return to footnote 2 referrer

Footnote 3

As per subsection 35(1) of the Pest Control Products Act.

Return to footnote 3 referrer

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