Re-evaluation Decision RVD2020-08, Dichlorvos and Its Associated End-use Products

Pest Management Regulatory Agency
20 August 2020
ISSN: 1925-1025 (PDF version)
Catalogue number: H113-28/2020-8E-PDF (PDF version)


To obtain a full copy of Re-evaluation Decision RVD2020-08, Dichlorvos 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 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.

Dichlorvos is a broad spectrum, non-systemic organophosphate insecticide used to manage various insect pests on greenhouse cucumbers, tomatoes and ornamentals, indoor and outdoor structural sites (for example, processing plants, storage facilities, theatres, animal buildings and various outdoor areas), and for mosquito control. Dichlorvos is applied indoors by hand sprayers, ultra-low volume applicators, and automatic foggers, and outdoors by ground equipment. It is also used in insecticide strips. Dichlorvos is registered for both commercial and domestic uses andcurrently registered products can be found in the Pesticide Label Search and in Appendix I.

The regulatory approach for the re-evaluation of dichlorvos was first presented in the Proposed Re-evaluation Decision PRVD2017-16, Dichlorvos,Footnote 1 which underwent a 90-day consultation period. The proposed decision is summarized below.

Health Canada received comments and information relating to the health and value assessments. Respondents are listed in Appendix II of RVD2020-08. These comments are summarized in Appendix III of RVD2020-08 along with the responses by Health Canada. The comments and new data/information resulted in some revisions to the risk assessments (see Science Evaluation Update) which resulted in changes to the proposed regulatory decision as described in PRVD2017-16. A reference list of information used as the basis for the proposed re-evaluation decision is included in PRVD2017-16; further information used in the re-evaluation decision is listed in Appendix VI of RVD2020-08.

This document (RVD2020-08) presents the final regulatory decisionFootnote 2 for the re-evaluation of dichlorvos, including the required risk mitigation measures to protect human health and the environment, and label amendments to bring labels to current standards. All products containing dichlorvos that are registered in Canada are subject to this re-evaluation decision.

Outcome of science evaluation

Following the consultation on the proposed re-evaluation decision, Health Canada revised the toxicology, occupational and residential risk assessments and/or risk mitigation based on the comments and information received. The revised assessment indicated that health risks from dichlorvos and its associated end-use products were not shown to be acceptable for certain uses of dichlorvos (such as spray and fogging application for certain crops/sites, and pest strip use in certain indoor areas) when used according to the label directions, or when additional mitigation measures are considered. As such, those uses are being cancelled.

Risk assessment for the commercial class pest strip product (for use in insect pheromone traps) did not required to be updated as risk was shown to be acceptable with mitigation measures in PRVD2017-16. For the remaining uses, value, health and environmental risks were shown to be acceptable, provided additional risk mitigation measures are implemented to protect human health. These include reclassifying some of the products from Commercial to Restricted class, and Domestic to Commercial class; restricting the sale and use of these indoor products to certified applicators only; and a provision of an information sheet to occupants of indoor treated sites. See the Risk Mitigation Measures for further details.

Regulatory decision for dichlorvos

Health Canada has completed the re-evaluation of dichlorvos. Under the authority of the Pest Control Products Act, Health Canada has determined that continued registration of some products containing dichlorvos is acceptable. An evaluation of available scientific information found that some uses of dichlorvos products meet current standards for protection of human health and the environment when used according to revised label directions. Therefore, label amendments to mitigate risks to the human health and environment, and label improvements to meet current standards are required for these uses.

However, spray and fogging application for certain crops/sites and pest strip use in certain indoor areas are cancelled since health risks are not shown to be acceptable when used according to the current conditions of registration, or when additional mitigation is considered. The risk mitigation measures are summarized below. No additional data are requested.

Risk Mitigation Measures

Registered pesticide product labels include specific directions for use. Directions include risk mitigation measures to protect human health and the environment and must be followed by law. The revised mitigation measures required, as a result of the re-evaluation of dichlorvos, are summarized below. Refer to Appendix V of RVD2020-08 for details.

Uses not supported by manufacturers for re-evaluation and will be removed from all product labels:

Human Health

To protect human health, the following risk-reduction measures are required for continued registration of dichlorvos in Canada.

Cancellation of use:

Label Amendment:


The following precautionary label statement is required:

Next steps

To comply with this decision, the required amendments (mitigation measures and label updates) must be implemented on all product labels no later than 24 months after the publication date of this decision document. Accordingly, both registrants and retailers will have up to 24 months from the date of this decision document to transition to selling the product with the newly amended labels. Similarly, users will also have the same 24-month period from the date of this decision document to transition to using the newly amended labels, which will be available on the Public Registry. Products that are cancelled will be phased out following the implementation timeline outlined below.

Other information

Any person may file a notice of objectionFootnote 3regarding this decision on dichlorvos within 60 days from the date of publication of RVD2020-08. For more information regarding the basis for objecting (which must be based on scientific grounds), please refer to the Pesticides section of the website (Request a Reconsideration of Decision) or contact the PMRA’s Pest Management Information Service.

The relevant test data on which the decision is based (as referenced in PRVD2017-16 and this RVD2020-08) are available for public inspection, upon application, in the PMRA’s Reading Room (located in Ottawa). For more information, please contact the PMRA’s Pest Management Information Service by phone (1-800-267-6315) or by e-mail (

Appendix I Registered dichlorvos products in Canada

Table 1 Registered dichlorvos products in CanadaFootnote 1
Registration Number Registrant Product Name Formulation Type Guarantee
Technical Active Ingredient
19723 AMVAC Chemical Corporation Dichlorvos (DDVP) Technical Liquid 96%
Commercial Class End-Use Products
11819 Gardex Chemicals Ltd. Gardex Vapona Insecticide Industrial Fogging Solution Emulsifiable concentrate or emulsion 4.65%
16476 Gardex Chemicals Ltd. Gardex Vapona-20 ULV Concentrate Emulsifiable concentrate or emulsion 20%
19680 Premier Tech Brighton Ltd. Pro Professional DDVP-20 Ultra-Low Volume Insecticide Solution 20%
21222 Aberdeen Road Company Hercon Vaportape II Insecticidal Strips Slow-release generator 10%
21824 Plus Dichlorvos Plus #1 Ready to Use Insecticide Solution 1.8%
23915Footnote 2 Loveland Products Canada Inc. DDVP 20% Insecticide Emulsifiable concentrate or emulsion 20%
Domestic Class End-Use Product
22027 Scotts Canada Ltd. Ortho Home Defense Max No-Pest Insecticide Strip Slow-release generator 19.2%
Footnote 1

as of 24 January 2020, excluding discontinued products or products with a submission for discontinuation

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Footnote 2

Product to be cancelled based on updated health risk assessment

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Footnote 1

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

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Footnote 2

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

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Footnote 3

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

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