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Consumer Product Safety

Proposed Maximum Residue Limit PMRL2012-37, Chlorpyrifos

Notice to the reader: The online consultation is now closed. Comments and suggestions received during the public consultation period are being considered in the finalization of this document. The final report will be made available as soon as possible.

Pest Management Regulatory Agency
17 July 2012
ISSN: 1925-0843 (PDF version)
Catalogue number: H113-24/2012-37E-PDF (PDF version)

Help on accessing alternative formats, such as Portable Document Format (PDF), Microsoft Word and PowerPoint (PPT) files, can be obtained in the alternate format help section.

Under the authority of the Next link will take you to another Web site Pest Control Products Act, Health Canada's Pest Management Regulatory Agency (PMRA) has concluded that the addition of a new use on green onions to the product label of Lorsban 4E Insecticide, containing technical grade chlorpyrifos, is acceptable. The specific use approved in Canada is detailed on the label of Lorsban 4E Insecticide, Pest Control Products Act Registration Number 14879.

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 MRL for chlorpyrifos is being conducted via this document (see Next Steps).

To comply with Canada's international trade obligations, consultation on the proposed MRL is also being conducted internationally by notifying the Next link will take you to another Web site World Trade Organization, as coordinated by the Next link will take you to another Web site Standards Council of Canada.

The proposed MRL in Canada in or on food, to be added to the MRLs already established for chlorpyrifos, is as follows

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

Table 1 footnotes

Table 1 footnote 1

= parts per million

Return to table 1 footnote ppm referrer

Chlorpyrifos O,O-diethyl-O-(3,5,6- trichloro-2-pyridyl) phosphorothioate, including the metabolite 3,5,6-trichloro-2-pyridinol 0.5 Green onion subgroup (Crop Subgroup 3-07B)

MRLs are proposed for each commodity included in the green onion subgroup in accordance with the Residue Chemistry Crop Groups webpage in the Pesticides and Pest Management section of Health Canada's website.

A complete list of pesticide MRLs established in Canada, as of the date indicated, can be found on the Maximum Residue Limits for Pesticides webpage in the Pesticides and Pest Management section of Health Canada's website.

International Situation and Trade Implications

The proposed green onion subgroup MRL for chlorpyrifos in Canada does not have a corresponding American tolerance or Codex MRLFootnote 2. American tolerances are listed in the Next link will take you to another Web site Electronic Code of Federal Regulations, 40 CFR Part 180, by pesticide. Codex MRLs are listed on the Codex Alimentarius Next link will take you to another Web site Pesticide Residues in Food website, by pesticide or commodity.

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 for chlorpyrifos and posting a corresponding Established Maximum Residue Limit document in the Pesticides and Pest Management section of Health Canada's website.


Footnote 1

The relevant report can be accessed by selecting Programs and Special Actions/Minor Use/Historical and requesting the Evaluation Report listed under Application Number 2011-0720.

Return to footnote 1 referrer

Footnote 2

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 2 referrer