Proposed Maximum Residue Limit PMRL2020-13, Triflumezopyrim

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Pest Management Regulatory Agency
29 July 2020
ISSN: 1925-0843 (PDF version)
Catalogue number: H113-24/2020-13E-PDF (PDF version)

Under the authority of the Pest Control Products Act, Health Canada's Pest Management Regulatory Agency (PMRA) is proposing to establish a maximum residue limit (MRL) for triflumezopyrim on rice to permit the import and sale of foods containing such residues.

Triflumezopyrim is an insecticide not currently registered for use in Canada.

The PMRA must determine the quantity of residues that are likely to remain in or on the imported food commodities when triflumezopyrim is used according to label directions in the exporting country, and that such residues will not be a concern to human health. This quantity is then legally established as an MRL on the corresponding imported commodity. 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 triflumezopyrim is being conducted via this document (see Next Steps). 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 Canada's Notification Authority and Enquiry Point.

The proposed MRL for triflumezopyrim is as follows.

Table 1: Proposed maximum residue limit for triflumezopyrim
Common name Residue definition MRL (ppm)Table 1: Tablenote 1 Food commodity

2,4-dioxo-1-(5-pyrimidinylmethyl)-3-[3-(trifluoromethyl)phenyl]-2H-pyrido[1,2-a]pyrimidinium inner salt

0.2 Rice

Table 1: Tablenote 1

Table 1: Tablenote 1

ppm = parts per million

Return to Table 1: 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

Table 2 compares the MRL proposed for triflumezopyrim in Canada with the corresponding American tolerance and Codex MRL.Footnote 1 American tolerances are listed inthe Electronic Code of Federal Regulations, 40 CFR Part 180, by pesticide. A listing of established Codex MRLs is available on the Codex Alimentarius Pesticide Index webpage, by pesticide or commodity.

Table 2: Comparison of Canadian MRL, American Tolerance and Codex MRL (where different)
Food commodity Canadian MRL (ppm) American tolerance (ppm) Codex MRL (ppm)
Rice 0.2 0.4 0.2

Next steps

The PMRA invites the public to submit written comments on the proposed MRL for triflumezopyrim 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 are entered into the Maximum Residue Limit Database.

Appendix I

Summary of field trial data used to support the proposed maximum residue limit

Residue data for triflumezopyrim in rice were submitted to support the maximum residue limit on imported rice from China and India. In addition, a processing study in treated rice was reviewed to determine the potential for concentration of residues of triflumezopyrim into rice processed commodities.

Maximum residue limit

The recommendation for a maximum residue limit (MRL) for triflumezopyrim was based upon the residues observed in crop commodities treated at exaggerated rates of the label in the exporting countries, and the guidance provided in the OECD MRL Calculator. Table A1 summarizes the residue data used to calculate the proposed MRL for imported rice.

Table A1: Summary of field trial and processing data used to support the MRL
Commodity Application method/
Total application rate
(g a.i./ha/season)Table A-1: Footnote 1
Preharvest interval (days) Lowest average field trial residues (ppm) Highest average field trial residues (ppm) Experimental processing factor
Rice Foliar ground application / 50 21 ± 1 <0.01 0.177 Brown rice: 0.1×
Polished rice: 0.1×
Rice bran: 0.5×

Table A-1: Footnotes

Table A-1: Footnote

g a.i./ha = kilograms of active ingredient per hectare

Return to Table A1: Footnote 1 referrer

Following the review of all available data, MRLs as proposed in Table 1 are recommended to cover residues of glufosinate-ammonium. Residues of glufosinate-ammonium in these crop commodities at the proposed MRLs will not pose any health risks of concern 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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