Proposed Maximum Residue Limit PMRL2018-49, Chlorothalonil

Notice to the reader:

This consultation is now closed.

Pest Management Regulatory Agency
20 November 2018
ISSN: 1925-0843 (PDF version)
Catalogue number: H113-24/2018-49E-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 chlorothalonil on edible-podded legume vegetables (crop subgroup 6A) to permit the import and sale of these vegetables containing such residues.

Chlorothalonil is a fungicide 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 chlorothalonil 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 chlorothalonil 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 replace the MRL already established for chlorothalonil, is as follows.

Table 1: Proposed Maximum Residue Limit for Chlorothalonil
Common Name Residue Definition MRL (ppm)1 Food Commodity
Chlorothalonil 2,4,5,6-tetrachloro-1,3-benzenedicarbonitrile including the metabolite 4-hydroxy-2,5,6-trichloro-1,3-benzenedicarbonitrile 5.02 Edible-podded legume vegetables (crop subgroup 6A)

ppm = parts per million

Return to footnote 1 referrer

This action extends the current MRL of 5.0 ppm on edible-podded snow peas to all commodities within crop subgroup 6A.

Return to footnote 2 referrer


MRLs are proposed for each commodity included in the listed crop grouping in accordance with the Residue Chemistry Crop Groups webpage in the Pesticides section of the Canada.ca 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

Table 2 compares the MRL proposed for chlorothalonil in Canada with the corresponding American tolerance and Codex MRL 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.

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)
Edible-podded legume vegetables (crop subgroup 6A) 5.0 5.0
(edible-podded pea)
None established

Next Steps

The PMRA invites the public to submit written comments on the proposed MRL for chlorothalonil 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 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 chlorothalonil in snap beans were available to support the maximum residue limit on imported edible-podded legume vegetables (crop subgroup 6A).

Maximum Residue Limit

The recommendation for the maximum residue limit (MRL) for chlorothalonil was based upon the residues observed in snap beans treated at exaggerated rates in the exporting country. Table A1 summarizes the residue data used to calculate the proposed MRL for imported edible-podded legume vegetables (crop subgroup 6A).

Table A1: Summary of Field Trial and Processing Data Used to Support the MRL
Commodity Application Method/ Total Application Rate
(kg a.i./ha) 1
Preharvest Interval (days) Lowest Average Field Trial Residues
(ppm)
Highest Average Field Trial Residues
(ppm)
Experimental Processing Factor
Snap beans Broadcast spray/
7.41–7.44
7 0.43 3.04 None

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

Return to footnote 1 referrer


Following the review of all available data, the MRL as proposed in Table 1 is recommended to cover residues of chlorothalonil. Residues of chlorothalonil in these imported crop commodities at the proposed MRL will not pose an unacceptable risk to any segment of the population, including infants, children, adults and seniors.

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

Report a problem or mistake on this page
Please select all that apply:

Thank you for your help!

You will not receive a reply. For enquiries, contact us.

Date modified: