Proposed Maximum Residue Limit PMRL2018-53, Metaldehyde
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This consultation is now closed.
Pest Management Regulatory Agency
22 November 2018
ISSN: 1925-0843 (PDF version)
Catalogue number: H113-24/2018-53E-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 a new use on ginseng to the product label of Deadline M-Ps, containing technical grade metaldehyde, is acceptable. The specific use approved in Canada is detailed on the label of Deadline M-Ps, Pest Control Products Act Registration Number 26650.
The evaluation of this metaldehyde 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.
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 metaldehyde, is as follows:
|Common Name||Residue Definition||MRL (ppm)Footnote 1||Food Commodity|
- Footnote 1
ppm = parts per million
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 metaldehyde 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 metaldehyde in or on any commodity on the Codex Alimentarius Pesticide Index webpage.
The PMRA invites the public to submit written comments on the proposed MRL for metaldehyde 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.
Summary of Field Trial Data Used to Support the Proposed Maximum Residue Limit
Residue data for metaldehyde in ginseng were submitted to support the domestic use of Deadline M-Ps on ginseng.
Maximum Residue Limit
The recommendation for a maximum residue limit (MRL) for metaldehyde 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 ginseng roots.
|Commodity||Application Method/ Total Application Rate
(kg a.i./ha)Footnote 1
|Preharvest Interval (days)||Lowest Average Field Trial Residues
|Highest Average Field Trial Residues
|Dried ginseng roots||Granular broadcast/
|21-22||< 0.05||< 0.05|
- Footnote 1
kg a.i./ha = kilograms of active ingredient per hectare
Following the review of all available data, the MRL proposed in Table 1 is recommended to cover residues of metaldehyde. Residues of metaldehyde in this commodity at the proposed MRL will not pose an unacceptable risk to any segment of the population, including infants, children, adults and seniors.
- Footnote 1
The Codex Alimentarius Commission is an international organization under the auspices of the United Nations that develops international food standards, including MRLs.
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