Proposed Maximum Residue Limit PMRL2020-11, MCPA

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Pest Management Regulatory Agency
23 July 2020
ISSN: 1925-0843 (PDF version)
Catalogue number: H113-24/2020-11-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 lentils, chickpeas, and dry beans to the product label of Goldwing Herbicide, containing technical grade MCPA and pyraflufen-ethyl, is acceptable. The specific uses approved in Canada are detailed on the label of Goldwing Herbicide, Pest Control Products Act Registration Number 32112.

The evaluation of this MCPA 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 MCPA is being conducted via this document (see Next Steps). A summary of the field trial data used to support the proposed MRL can be found in Appendix I. The currently established MRLs for pyraflufen-ethyl in/on the food crops listed above is sufficient to cover the residues resulting from this new use and is therefore unaffected by this MRL action.

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 MCPA, is as follows.

Table 1 Proposed maximum residue limit for MCPA
Common name Residue definition MRL (ppm)Table 1 Footnote 1 Food commodityTable 1 Footnote 2
MCPA (4-chloro-2-methylphenoxy)acetic acid 0.1 Dried shelled pea and bean (crop subgroup 6C, except soybean)
Table 1 Footnote 1

ppm = parts per million

Table 1 Return to footnote 1 referrer

Table 1 Footnote 2

The MRL is proposed to extend the currently established MRL of 0.1 ppm for dry field peas to the remaining commodities of the crop subgroup.

Table 1 Return to footnote 2 referrer

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 the 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 MRL proposed for MCPA in Canada with corresponding American tolerance and Codex MRL.Footnote 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.

Table 2 Comparison of Canadian MRL, American Tolerance and Codex MRL (where different)
Food commodity Canadian MRL (ppm) American Tolerance
Codex MRL
Dried shelled pea and bean (crop subgroup 6C, except soybean) 0.1 0.1 (dry peas) 0.01 (dry peas)

Next steps

The PMRA invites the public to submit written comments on the proposed MRL for MCPA 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 MCPA in dried peas and beans were submitted to support the domestic use of Goldwing Herbicide on commodities belonging to crop subgroup 6C, including lentils, chickpeas, and dry beans.

Maximum residue limit

The recommendation for the maximum residue limit (MRL) for MCPA 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 crop subgroup 6C (dried shelled peas and beans (except soybeans)).

Table A1 Summary of field trial data used to support the MRL
Commodity Application method/ Total application rate
(g a.e./ha)Table A1 Footnote 1
Preharvest interval (days) Lowest average field trial residues
Highest Average Field Trial Residues
Dried peas Soil applied broadcast, pre-emergent to crop/ 392–421 93–113 <0.01 <0.01
Dried beans Soil applied broadcast, pre-emergent to crop/382–419 104–143 <0.01 <0.01
Table A1 Footnote 1

g a.e./ha = grams of active ingredient as acid equivalent per hectare

Table A1 Return to footnote 1 referrer


Following the review of all available data, the MRL as proposed in Table 1 is recommended to cover residues of MCPA in/on crop subgroup 6C. Residues of MCPA in these crop commodities at the proposed MRL will not pose an unacceptable health 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.

Return to footnote 1 referrer

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