Proposed Re-evaluation Decision PRVD2021-01, Flufenacet and Its Associated End-use Products
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Pest Management Regulatory Agency
28 January 2021
ISSN: 1925-0967 (PDF version)
Catalogue number: H113-27/2021-1E-PDF (PDF version)
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Table of contents
- Proposed re-evaluation decision for flufenacet and associated end use products
- Proposed re-evaluation decision for flufenacet
- Risk mitgation measures
- International context
- Next steps
- Additional scientific information
Proposed re-evaluation decision for flufenacet and associated end use products
Under the authority of the Pest Control Products Act, all registered pesticides must be 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, as well as comments received during public consultations. Health Canada applies internationally accepted risk assessment methods as well as current risk management approaches and policies.
Flufenacet is a herbicide registered for use on field corn and soybeans to control annual grasses and broadleaf weeds in Eastern Canada. The application timing is preplant, pre-emergent and early post-emergent, with one application per season. Currently registered products containing flufenacet can be found in the Pesticide Label Search and in Appendix I of PRVD2021-01.
This document (PRVD2021-01, Flufenacet and Its Associated End-use Products) presents the proposed re-evaluation decision for flufenacet, including the proposed risk mitigation measures to protect human health and the environment, as well as the science evaluation on which the proposed decision is based. All products containing flufenacet registered in Canada are subject to this proposed re-evaluation decision. This document (PRVD2021-01) 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 PMRA Publications. The final re-evaluation decision will be published after taking into consideration the comments and information received during the consultation period.
Proposed re-evaluation decision for flufenacet
Under the authority of the Pest Control Products Act and based on an evaluation of available scientific information, Health Canada is proposing cancellation of the registration of flufenacet and all associated end-use products registered for sale and use in Canada as the potential risk to human health was not shown to be acceptable.
With respect to human health, dietary risks were not shown to be acceptable when used according to current conditions of registration. Occupational risks to mixer/loaders and applicators were not shown to be acceptable when used according to current conditions of registration, or when additional mitigation measures were considered (such as higher levels of personal protective equipment (PPE) and engineering controls).
Flufenacet poses potential risks to birds, aquatic organisms and terrestrial plants. However, potential risks to the environment from flufenacet were shown to be acceptable with additional mitigation measures, such as precautionary label statements and spray buffer zones for the protection of terrestrial and aquatic habitats (2–4 metres).
Flufenacet has value as an effective weed management tool for use in conventional or non-glyphosate tolerant field corn and soybean. Cancellation of flufenacet and its associated end-use products is expected to have minimal impact on Canadian growers since many effective alternative herbicides are available.
Risk mitgation measures
The following risk management measure is proposed to address the identified dietary and occupational risks (mixing/loading/application) resulting from the use of flufenacet:
- Cancellation of all flufenacet products and uses.
The following risk-reduction measures are identified to mitigate potential risks to workers entering treated areas to conduct postapplication activities. However, as all uses are proposed for cancellation based on the potential dietary and occupational (mixing/loading/application) risks, these risk mitigation measures are not included as part of the proposed re-evaluation decision at this time.
- For postapplication workers following preplant (soil-injected and soil-incorporated) application to soybean and field corn:
- Restricted-entry interval (REI) of 12 hours
- For postapplication workers following preplant (surface spray), pre-emergent and early post-emergent application to soybean and field corn:
- REIs of 11-22 days
The following risk-reduction measures are identified to mitigate potential risks to the environment. However, as all uses are proposed for cancellation based on the potential human health risks, the risk mitigation measures related to the environment are not included as part of the proposed re-evaluation decision at this time.
- Precautionary label statements for birds, aquatic organisms and terrestrial plants.
- Spray buffer zones on products labels for the protection of terrestrial and aquatic habitats (2–4 meters).
- A leaching advisory statement.
- To reduce the potential for runoff of flufenacet to adjacent aquatic habitats, precautionary label statements for sites with characteristics that may be conducive to runoff and when heavy rain is forecast.
Flufenacet is currently acceptable for use in other Organisation for Economic Co-operation and Development (OECD) member countries including the United States, the European Union, and Australia. No decision by an OECD member country to prohibit all uses of flufenacet for health or environmental reasons has been identified as of 4 September 2020.
The public, including pesticide manufacturers and stakeholders, are encouraged to submit comments and information on this proposed decision (PRVD2021-01) during the 90-day public consultation periodFootnote 1
All comments received during the 90-day public consultation period will be taken into consideration in preparation of the re-evaluation decision document,Footnote 2 which could result in revised risk mitigation measures. 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 with Health Canada’s responses.
Additional scientific information
No additional scientific data are required at this time.
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