Proposed Maximum Residue Limit PMRL2016-58, Cyazofamid

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Pest Management Regulatory Agency
17 October 2016
ISSN: 1925-0843 (PDF version)
Catalogue number: H113-24/2016-58E-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 Bulb Vegetables (except daylily, elegans hosta, fritillaria, and lily) to the product label of Cyazofamid 400SC Fungicide™, containing technical grade cyazofamid, is acceptable. The specific uses approved in Canada are detailed on the label of Cyazofamid 400SC Fungicide™, Pest Control Products Act Registration Number 27984.

The evaluation of this cyazofamid application indicated that the end-use product has value and the human health and environmental risks associated with the new use are acceptable.

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 cyazofamid is being conducted via this document (see Next Steps, the last section of this document). 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 the Canada's Notification Authority and Enquiry Point.

The proposed MRL, to be added to the MRLs already established for cyazofamid, is as follows.

Table 1 Proposed Maximum Residue Limit for Cyazofamid
Common Name Residue Definition MRL (ppm)Table 1 footnote 1 Food Commodity
Cyazofamid 4-chloro-2-cyano-N,N-dimethyl-5-(4-methylphenyl)-1H-imidazole-1-sulfonamide including the metabolite, 4-chloro-5-(4-methylphenyl)-1H-imidazole-2-carbonitrile 2.0 Bulb Vegetables (CG3-07)
Table 1 footnote 1

ppm = parts per million

Return to table 1 footnote 1 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 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 cyazofamid in Canada is the same as the corresponding American tolerance as listed in the Electronic Code of Federal Regulations, 40 CFR Part 180, by pesticide. Currently, there are no Codex MRLsFootnote 1 listed for cyazofamid in or on any commodity on the Codex Alimentarius Pesticide Residues in Food and Feed webpage.

Table 2 Comparison of Canadian MRLs, American Tolerances and Codex MRLs (where different)
Food Commodity Canadian MRL
American Tolerance
Codex MRL
Bulb Vegetables 2.0 2.0 Not Established

Next Steps

The PMRA invites the public to submit written comments on the proposed MRL for cyazofamid up to 75 days from the date of publication of this document. Please forward your comments to Publications (see the contact information on the cover page of this document). 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 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 cyazofamid in dry bulb onion and green onion were submitted to support the domestic use of Cyazofamid 400SC Fungicide™ on bulb vegetables.

Maximum Residue Limits

The recommendation for a maximum residue limit (MRL) for cyazofamid was based upon the submitted field trial data, and the guidance provided in the OECD MRL Calculator. Table A1 summarizes the residue data used to calculate the proposed MRL for bulb vegetables.

Table A1 Summary of Field Trial and Processing Data Used to Support MRL
Commodity Application Method/ Total Application Rate
(g a.i./ha)Table A1 footnote 1
Preharvest Interval
Lowest Average Field Trial Residues
(ppm)Table A1 footnote 2
Highest Average Field Trial Residues
(ppm)Table A1 footnote 2
Experimental Processing Factor
Dry bulb onion Broadcast spray/ 455-485 0 0.047 0.895 None
Green onion 0.490 1.101
Table A1 footnote 1

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

Return to table A1 footnote 1 referrer

Table A1 footnote 1

Expressed as parent equivalents.

Return to table A1 footnote 2 referrer

Following the review of all available data, the MRL as proposed in Table 1 is recommended to cover total residues of cyazofamid. Total residues of cyazofamid in these crop commodities 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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