Proposed Maximum Residue Limit PMRL2017-35, Imidacloprid
Notice to the reader:This consultation is now closed.
Pest Management Regulatory Agency
19 December 2017
ISSN: 1925-0843 (PDF version)
Catalogue number: H113-24/2017-35E-PDF (PDF version)
Under the authority of the Pest Control Products Act, Health Canada’s Pest Management Regulatory Agency (PMRA) is proposing to establish maximum residue limit (MRLs) for imidacloprid on various commodities to permit the import and sale of foods containing such residues.
Imidacloprid is an insecticide 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 imidacloprid 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 MRLs for imidacloprid is being conducted via this document (see Next Steps). A summary of the field trial data used to support the proposed MRLs can be found in Appendix I.
To comply with Canada’s international trade obligations, consultation on the proposed MRLs is also being conducted internationally by notifying the World Trade Organization, as coordinated by Canada’s Notification Authority and Enquiry Point.
The proposed MRLs, to be added to the MRLs already established for imidacloprid, are as follows.
|Common Name||Residue Definition||MRL (ppm)Table 1 Footnote 1||Food Commodity|
|Imidacloprid||(2E)-1-[(6-chloro-3-pyridinyl)methyl]-N-nitro-2-imidazolidinimine, including metabolites containing the 6-chloropyridinyl moiety||50||Tea (dried leaves)|
|1.0||Green coffee beans, pomegranates|
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 MRLs proposed for imidacloprid in Canada with corresponding American tolerances and Codex MRLs.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 Residues in Food and Feed website, by pesticide or commodity.
|Food Commodity||Canadian MRL (ppm)||American Tolerance
|Tea (dried leaves)||50||Not Established||50|
|Green coffee beans||1.0||0.8||1.0|
The PMRA invites the public to submit written comments on the proposed MRLs for imidacloprid 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.
Summary of Field Trial Data Used to Support the Proposed Maximum Residue Limits
Residue data for imidacloprid in bananas, pomegranates, coffee, olives and tea were submitted to support the maximum residue limits on these imported crops. In addition, processing studies in treated coffee beans, olives and tea were reviewed to determine the potential for concentration of residues of imidacloprid into processed commodities.
Maximum Residue Limits
The recommendation for maximum residue limits (MRLs) for imidacloprid 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 MRLs for imported crops.
|Commodity||Application Method/ Total Application Rate
(g a.i./ha)Table a1 Footnote 1
|Preharvest Interval (days)||Lowest Average Field Trial Residues
|Highest Average Field Trial Residues
|Experimental Processing Factor|
|Pomegranates||Foliar and Soil Application/
|Green coffee beans||Foliar Application/
|6-7||0.182||0.473||Instant coffee (1.3×)|
|Olives||Foliar Application/100||7-8||<0.05||1.1||Residues did not concentrate in food commodities.|
|Tea (dried leaves)||Foliar Application/400||7||2.0||28||Residues did not concentrate in food commodities.|
Following the review of all available data, MRLs as proposed in Table 1 are recommended to cover residues of imidacloprid. Residues of imidacloprid in these imported crop commodities at the proposed MRLs 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.
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