Proposed Maximum Residue Limit PMRL2015-58, Metconazole

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Pest Management Regulatory Agency
13 November 2015
ISSN: 1925-0843 (PDF version)
Catalogue number: H113-24/2015-58E-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 crop subgroup 20B to the product label of Quash Fungicide, containing technical grade metconazole, is acceptable. The specific uses approved in Canada are detailed on the label of Quash Fungicide, Pest Control Products Act Registration Number 30402.

The evaluation of this metconazole application indicated that the end-use product has value and the human health and environmental risks associated with the new uses 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 metconazole 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 metconazole, are as follows.

Table 1 Proposed Maximum Residue Limits for Metconazole
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

Metconazole 5-[(4-chlorophenyl)methyl]-2,2-dimethyl-1-(1H-1,2,4-triazol-1-ylmethyl)cyclopentanol 0.7 Sunflowers (Crop Subgroup 20B)

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

The MRL proposed for metconazole in Canada are the same as corresponding American tolerances as listed in the  Electronic Code of Federal Regulations, 40 CFR Part 180, by pesticide. Currently, there are no Codex MRLsFootnote 1 listed for metconazole in or on any commodity on the Codex Alimentarius  Pesticide Residues in Food webpage.

Next Steps

The PMRA invites the public to submit written comments on the proposed MRL for metconazole 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 it is 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 metconazole in sunflowers were submitted to support the domestic use of Quash Fungicide on Crop Subgroup 20B. In addition, a processing study in treated sunflowers was reviewed to determine the potential for concentration of residues of metconazole into processed commodities.

Maximum Residue Limit

The recommendation for maximum residue limit (MRL) for metconazole 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 metconazole.

Table A1 Summary of Field Trial and Processing Data Used to Support MRL
Commodity Application Method/ Total Application Rate
(g a.i./ha)Table 1A footnote 1
Preharvest Interval (days) Lowest Average Field Trial Residues
(ppm)
Highest Average Field Trial Residues
(ppm)
Experimental Processing Factor

Table 1A footnotes

Table 1A footnote 1

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

Return to table 1A footnote 1 referrer

Sunflower seed Foliar application/
275-291
20-21 <0.04 0.44 0.2×
(meal and oil)

Following the review of all available data, the MRL as proposed in Table 1 is recommended to cover residues of metconazole. Residues of metconazole 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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