Proposed Maximum Residue Limit PMRL2014-38, Chlorpyrifos

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Pest Management Regulatory Agency
26 June 2014
ISSN: 1925-0843 (PDF version)
Catalogue number: H113-24/2014-38E-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 dry bulb shallots to the product label of Lorsban 15G Granular Insecticide, containing technical grade chlorpyrifos, is acceptable. The specific use approved in Canada is detailed on the label of Lorsban 15G Granular Insecticide, Pest Control Products Act Registration Number 16458.

The evaluation of this chlorpyrifos application indicated that the end-use product has merit and value and the human health and environmental risks associated with the new use are acceptable. Details regarding the registration can be found in the corresponding Evaluation Report available in the Pesticides and Pest Management section of Health Canada's website, under Public Registry, Pesticide Product Information Database.Footnote 1

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 MRLs for chlorpyrifos is being conducted via this document (see Next Steps, the last section of this document).

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 the  Standards Council of Canada.

The proposed MRLs, to be added to the MRLs already established for chlorpyrifos, are as follows.

Table 1 Proposed Maximum Residue Limit for Chlorpyrifos
Common Name Residue Definition MRL (ppm)Table 1 footnote 1 Food Commodity

Table 1 footnotes

Table 1 footnote 1

ppm = parts per million

Return to table 1 footnote 1 referrer

Chlorpyrifos O,O-diethyl-O-(3,5,6- trichloro-2-pyridyl) phosphorothioate, including the metabolite 3,5,6-trichloro-2-pyridinol 0.2 Bulb onion subgroup (Crop Subgroup 3-07A)

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

MRLs may vary from one country to another for a number of reasons, including differences in pesticide use patterns and the locations of the field crop trials used to generate residue chemistry data.

Table 2 compares the MRLs proposed for chlorpyrifos in Canada with the corresponding American tolerance and Codex MRLFootnote 2. 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 Residues in Food website, by pesticide or commodity.

Table 2 Comparison of the Canadian MRL, American Tolerance and Codex MRL (where different)
Food Commodity Canadian MRL (ppm) American Tolerance (ppm) Codex MRL (ppm)
Bulb onion subgroup (Crop Subgroup 3-07A) 0.2 0.5
(Onion, bulb)
0.2
(Onion, Bulb)

Next Steps

The PMRA invites the public to submit written comments on the proposed MRLs for chlorpyrifos 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.

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