Proposed Maximum Residue Limit PMRL2021-13, Metalaxyl
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Pest Management Regulatory Agency
13 May 2021
ISSN: 1925-0843 (PDF version)
Catalogue number: H113-24/2021-13E-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 new uses on various commodities to the product label of Orondis Gold Fungicide, containing technical grade metalaxyl-M and S-isomer and oxathiapiprolin, is acceptable. The specific uses approved in Canada are detailed on the label of Orondis Gold Fungicide, Pest Control Products Act Registration Number 33508.
The evaluation of this metalaxyl-M 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.
Residues of the resolved isomer metalaxyl-M are covered by MRLs established for metalaxyl, the unresolved isomeric mixture. Consultation on the proposed MRLs for metalaxyl is being conducted via this document (see Next Steps). MRL consultation for the other active ingredient, oxathiapiprolin, present in Orondis Gold Fungicide is being conducted under a separate action. 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 Canada’s Notification Authority and Enquiry Point.
The proposed MRLs, to replace or be added to the MRLs already established for metalaxyl, are as follows.
|Common name||Residue definition||MRL (ppm)Footnote 1||Food commodity|
|Metalaxyl||Methyl N-(2,6-dimethylphenyl)-N-(methoxyacetyl)-DL-alaninate, including metabolites that can be converted to the 2,6-dimethylaniline moiety, each expressed as metalaxyl equivalents||10||Bearberries, bilberries, cloudberries, lowbush blueberries,Footnote 2 muntries, partridgeberries|
|1.5||Caneberries (crop subgroup 13-07A)Footnote 3|
|0.5||Tree Nuts (crop group 14-11, except almond nuts, black walnuts, and English walnuts)Footnote 4|
MRLs are proposed for each commodity included in the listed crop groupings 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
MRLs may vary from one country to another for a number of reasons, including differences in pesticide use patterns and the locations of the crop field trials used to generate residue chemistry data.
Table 2 compares the MRLs proposed for metalaxyl in Canada with corresponding American tolerances for metalaxyl and Codex MRLs for metalaxyFootnote 1. American tolerances are listed inthe 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.
|Food commodity||Canadian MRL (ppm)||American Tolerance (ppm)||Codex MRL
|Bearberries, bilberries, cloudberries, lowbush blueberriesFootnote 1, muntries, partridgeberries||10||2.0
|Caneberries (crop subgroup 13-07A)||1.5||0.5
(Raspberries, red, black)
|Tree Nuts (crop group 14-11, except almond nuts, black walnuts, and English walnuts)||0.5||Not established||Not established|
The PMRA invites the public to submit written comments on the proposed MRLs for metalaxyl 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.
Summary of field trial data used to support the proposed maximum residue limits
Residue data for metalaxyl-M in pecans were submitted to support the domestic use of metalaxyl-M on tree nuts (crop group 14-11). Previously reviewed residue data from field trials conducted in/on almonds, strawberries, raspberries and blackberries were reassessed in the framework of this petition to support the domestic use of metalaxyl-M on caneberries (crop subgroup 13-07A), low growing berries (crop subgroup 13-07G, except lingonberries and cranberries) and tree nuts (crop group 14-11).
Maximum residue limits
The recommendation for maximum residue limits (MRLs) for metalaxyl 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 MRLs for crop subgroup 13-07A (caneberries), various low growing berries, and crop group 14-11 (tree nuts).
|Commodity||Application method/ Total application rate (g a.i./ha)Footnote 1||Preharvest interval (days)||Lowest average field trial residues (ppm)||Highest average field trial residues (ppm)|
|Raspberries||Soil-directed + foliar/
|Blackberries||Soil-directed + foliar/
|Strawberries||Soil drench + drip irrigation/
|Pre- or post-transplant + foliar/
|Foliar or drench broadcast/
Following the review of all available data, MRLs as proposed in Table 1 are recommended to cover residues of metalaxyl. Residues of metalaxyl in these 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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