Proposed Maximum Residue Limit PMRL2014-86, Zoxamide

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Pest Management Regulatory Agency
27 November 2014
ISSN: 1925-0843 (PDF version)
Catalogue number: H113-24/2014-86E-PDF (PDF version)

Under the authority of the  Pest Control Products Act, Health Canada's Pest Management Regulatory Agency (PMRA) is proposing to specify maximum residue limits (MRLs) for zoxamide on tomatoes and Crop Group 9 Cucurbit Vegetables to permit the import and sale of foods containing such residues.

Zoxamide is a fungicide currently registered in Canada for use on potatoes and grapes.

The PMRA must determine the quantity of residues that are likely to remain in or on the imported food commodities when zoxamide 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 MRLs for zoxamide 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 MRLs can be found in Appendix I.

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 zoxamide, are as follows.

Table 1 Proposed Maximum Residue Limits for Zoxamide
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

Zoxamide 3,5-Dichloro-N-(3-chloro-1-ethyl-1-methyl-2-oxopropyl)-4-methylbenzamide 2.0 Crop Group 9, Cucurbit Vegetables; Tomatoes

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 MRLs proposed for zoxamide in Canada are the same as corresponding Codex MRLs.Footnote 1 Table 2 compares the MRLs proposed for zoxamide in Canada with corresponding American tolerances. 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 Canadian MRLs, American Tolerances and Codex MRLs (where different)
Food Commodity Canadian MRL (ppm) American Tolerance (ppm)
Crop Group 9, Cucurbit Vegetables 2.0 1.0

Next Steps

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

Appendix I

Summary of Field Trial Data Used to Support the Proposed Maximum Residue Limits

Residue data for zoxamide in tomatoes and representative cucurbit vegetables of Crop Group 9 (cantaloupe, zucchini and cucumber) were submitted to support the MRLs on imported tomatoes and cucurbit vegetables (Crop Group 9). In addition, a processing study in treated tomatoes was reviewed to determine the potential for concentration of residues of zoxamide into processed commodities.

Maximum Residue Limit(s)

The recommendation for MRLs for zoxamide was based upon the residues observed in crop commodities treated according to label directions or to exaggerated rates in the exporting country, and the guidance provided in the  OECD MRL Calculator. Table A1 summarizes the residue data used to calculate the proposed MRLs for imported tomatoes and cucurbit vegetables (Crop Group 9).

Table A1 Summary of Field Trial and Processing Data Used to Support MRLs
Commodity Application Method/
Total Application Rate
(g a.i./ha)Table a1 footnote 1
Preharvest Interval
Minimum Zoxamide Residues (ppm) Maximum Zoxamide Residues (ppm) Experimental Processing Factor

Table a1 footnotes

Table a1 footnote 1

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

Return to table a1 footnote 1 referrer

Tomato Foliar broadcast/
5 0.054 1.18 Puree: 0.3X
Paste: 0.7X
Cantaloupe Foliar broadcast/
0 0.0335 0.731 Not applicable
Zucchini Foliar broadcast/
0.0236 0.393
Cucumber Foliar broadcast/
<0.010 0.129

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

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