Proposed Maximum Residue Limit PMRL2014-40, Fomesafen

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Pest Management Regulatory Agency
26 June 2014
ISSN: 1925-0843 (PDF version)
Catalogue number: H113-24/2014-40E-PDF (PDF version)

Under the authority of the Pest Control Products Act, Health Canada's Pest Management Regulatory Agency (PMRA) has concluded that the addition of the new use on cucumbers to the product label of Reflex Liquid Herbicide, containing technical grade fomesafen, is acceptable. The specific uses approved in Canada are detailed on the label of Reflex Liquid Herbicide, Pest Control Products Act Registration Number 24779.

The evaluation of this fomesafen application indicated that the end-use product has merit and value and the human health and environmental risks associated with the new uses are acceptable.

Before registering a pesticide for food use in Canada, the PMRA must determine the quantity of residues that are likely to remain in or on the food when the pesticide is used according to label directions and that such residues will not be a concern to human health. This quantity is then legally established as a maximum residue limit (MRL). An MRL applies to the identified raw agricultural food commodity as well as to any processed food product that contains it, except where separate MRLs are specified for the raw agricultural commodity and a processed product made from it.

Consultation on the proposed MRL for fomesafen is being conducted via this document (see Next Steps, the last section of this document). A summary of the field trial data used to support the proposed MRL can be found in Appendix I.

To comply with Canada's international trade obligations, consultation on the proposed MRL is also being conducted internationally by notifying the World Trade Organization, as coordinated by the Standards Council of Canada.

The proposed MRL, to be added to the MRLs already established for fomesafen, is as follows.

Table 1 Proposed Maximum Residue Limit for Fomesafen
Common Name Residue Definition MRL (ppm)Footnote 1 Food Commodity
Fomesafen 5-[2-chloro-4-(trifluoromethyl)phenoxy]-N-(methylsulfonyl)-2-nitrobenzamide 0.025 Cucumbers


Footnote 1

ppm = parts per million

Return to footnote 1 referrer

MRLs established in Canada may be found using the Maximum Residue Limit Database on the Maximum Residue Limits for Pesticides webpage. The database allows users to search for established MRLs, regulated under the Pest Control Products Act, both for pesticides or for food commodities.

International Situation and Trade Implications

The MRL proposed for fomesafen in Canada is the same as the corresponding American tolerance as listed in the Electronic Code of Federal Regulations, 40 CFR Part 180, by pesticide. Currently, there are no Codex MRLsFootnote 1 listed for fomesafen in or on any commodity on the Codex Alimentarius Pesticide Residues in Food webpage.

Next Steps

The PMRA invites the public to submit written comments on the proposed MRL for fomesafen up to 75 days from the date of publication of this document. Please forward your comments to Publications. The PMRA will consider all comments received before making a final decision on the proposed MRL. Comments received will be addressed in a separate document linked to this PMRL. The established MRL will be legally in effect as of the date that it is entered into the Maximum Residue Limit Database.

Appendix I

Summary of Field Trial Data Used to Support the Proposed MRL

Residue data from field trials conducted in Canada and the United States were submitted to support the domestic use of Reflex Liquid Herbicide on cucumbers. Fomesafen was applied to the crop at exaggerated rates and the cucumbers were harvested according to the proposed label directions.

Maximum Residue Limit

The recommendation for the maximum residue limit (MRL) for fomesafen was based upon the submitted field trial data, and the guidance provided in the OECD MRL Calculator. Table A1 summarizes the residue data used to calculate the proposed MRL for cucumbers.

Table A1 Summary of Field Trial Data Used to Support Maximum Residue Limit (MRL)
Commodity Application Method / Total Application Rate
(g a.e./ha)
Preharvest Interval
Residues (ppm)
Min Max
Cucumbers Application directed to the row middles (prior to transplanting or preemergence after seeding) / 538-594 42-82 <0.025 <0.025

Following the review of all available data, an MRL of 0.025 ppm is recommended to cover residues of fomesafen. Residues of fomesafen in/on cucumbers at the proposed MRL will not pose an unacceptable risk to any segment of the population, including infants, children, adults and seniors.


Footnote 1

The Codex Alimentarius Commission is an international organization under the auspices of the United Nations that develops international food standards, including MRLs.

Return to footnote 1 referrer

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