Proposed Maximum Residue Limit PMRL2018-24, Quinclorac

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This consultation is now closed.

Pest Management Regulatory Agency
17 July 2018
ISSN: 1925-0843 (PDF version)
Catalogue number: H113-24/2018-24E-PDF

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 quinclorac on low growing berries, except strawberries (Crop Subgroup 13-07H) to permit the import and sale of foods containing such residues.

Quinclorac is an herbicide currently registered in Canada for use on various commodities.

The PMRA must determine the quantity of residues that are likely to remain in or on the imported food commodities when quinclorac 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 quinclorac 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, to be added to the MRLs already established for quinclorac, is as follows.

Table 1 - Proposed Maximum Residue Limit for Quinclorac

Common Name Residue Definition MRL (ppm)Footnote 1 Food Commodity
Footnote 1

ppm = parts per million

Return to footnote 1 referrer

Quinclorac 3,7-dichloro-8-quinolinecarboxylic acid 1.5 Low growing berries, except strawberries (Crop Subgroup 13-07H)

MRLs are proposed for each commodity included in the listed crop groupings in accordance with the Residue Chemistry Crop Groups webpage in the Pesticides and Pest Management section of Health Canada’s website.

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 quinclorac in Canada is the same as the corresponding American tolerance and Codex MRLFootnote 1 American tolerances are listed in the 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.

Next Steps

The PMRA invites the public to submit written comments on the proposed MRLs for quinclorac 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 MRLs. Comments received will be addressed in a separate document linked to this PMRL. The established MRLs will be legally in effect as of the date that they 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 quinclorac in cranberries were submitted to support the maximum residue limit on imported low growing berries, except strawberries (Crop Subgroup 13-07H).

Maximum Residue Limit

The recommendation for a maximum residue limit (MRL) for quinclorac was based upon the residues observed in crop commodities treated according to label directions in the exporting country, and the guidance provided in the OECD MRL Calculator. Table A1 summarizes the residue data used to calculate the proposed MRL for imported low growing berries, except strawberries (Crop Subgroup 13-07H).

Table A1 - Summary of Field Trial Data Used to Support the MRL

Commodity Application Method/ Total Application Rate
(g a.i./ha)Footnote 1
Preharvest Interval (days) Lowest Average Field Trial Residues
Highest Average Field Trial Residues
Footnote 1

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

Return to footnote 1 referrer

Cranberries Foliar broadcast /
57-62 0.16 0.67

Following the review of all available data, an MRL as proposed in Table 1 is recommended to cover residues of quinclorac. Residues of quinclorac on imported low growing berries, except strawberries (Crop Subgroup 13-07H) at the proposed MRL will not pose an unacceptable risk to any segment of the population, including infants, children, adults and seniors.

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