Proposed Maximum Residue Limit PMRL2021-10, Glyphosate

Pest Management Regulatory Agency
6 May 2021
ISSN: 1925-0843 (PDF version)
Catalogue number: H113-24/2021-10E-PDF (PDF version)

Under the authority of the Pest Control Products Act, Health Canada's Pest Management Regulatory Agency (PMRA) is proposing to establish maximum residue limits (MRLs) for glyphosate on various commodities to permit the import and sale of foods containing such residues as well as to update the food commodity descriptors to remove historical terminology of currently established MRLs on processed cereal food commodities.

Glyphosate is a herbicide currently registered in Canada for use on various commodities.

The PMRA must determine the quantity of residues that are likely to remain in or on the imported food commodities when glyphosate 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 glyphosate is being conducted via this document (see Next steps). 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 Canada's Notification Authority and Enquiry Point.

The proposed MRLs, to replace or be added to the MRLs already established for glyphosate, are as follows.

Table 1 Proposed maximum residue limits for glyphosate
Common name Residue definition MRL
(ppm)Table 1 Footnote 1
Food commodity
Glyphosate N-(phosphonomethyl) glycine, including the metabolite aminomethylphosphonic acid (expressed in parent equivalents) 35Table 1 Footnote 2 Groats/rolled oats, oat bran
15Table 1 Footnote 2,Table 1 Footnote 3,Table 1 Footnote 5 Barley bran, dry adzuki beans, dry beans, dry blackeyed peas, dry broad beans, dry catjang seeds, dry chickpeas, dry cowpea seeds, dry guar seeds, dry kidney beans, dry lablab beans, dry lima beans, dry moth beans, dry mung beans, dry navy beans, dry pink beans, dry pinto beans, dry rice beans, dry southern peas, dry tepary beans, dry urd beans, grain lupin, pearled barley, wheat bran, wheat germ
10Table 1 Footnote 4,Table 1 Footnote 5 Dry field peas, dry lentils, dry pigeon peas
1.0 Tree nuts (crop group 14-11)

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 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

Table 2 compares the MRLs proposed for glyphosate in Canada with corresponding American tolerances and Codex MRLs.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 MRLs, American Tolerances and Codex MRLs
Food commodity Canadian MRL
(ppm)
American Tolerance
(ppm)
Codex MRL
(ppm)
Groats/rolled oats,
oat bran
35 30
(barley, bran; grain, cereal, group 15 except field corn, popcorn, rice, sweet corn, and wild rice)
30
(cereal grains)
Barley bran, pearled barley, wheat germ 15
Wheat bran 20
(wheat bran, unprocessed)
Dry adzuki beans, dry beans, dry blackeyed peas, dry broad beans, dry catjang seeds, dry chickpeas, dry cowpea seeds, dry guar seeds, dry kidney beans, dry lablab beans, dry lima beans, dry moth beans, dry mung beans, dry navy beans, dry pink beans, dry pinto beans, dry rice beans, dry southern peas, dry tepary beans, dry urd beans, grain lupin 15 5.0
(vegetable, legume, group 6, except soybean and dry pea)
2
(beans, dry)Table 2 Footnote 1
Dry field peas, dry lentils, dry pigeon peas 10 8.0
(pea, dry)
5
(lentil, dry;
peas, dry)Table 2 Footnote 2
Tree nuts (crop group 14-11) 1.0 1.0
(nut, tree, group 14)
Not established

Next steps

The PMRA invites the public to submit written comments on the proposed MRLs for glyphosate 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 glyphosate in dry peas, dry lentils and dry beans, as well as in almonds, pecans and walnuts, were submitted to support the maximum residue limits in/on these imported food commodities. Previously reviewed residue data from field trials conducted in/on these crops were also re-assessed in the framework of this petition.

Maximum residue limits

The recommendation for maximum residue limits (MRLs) for glyphosate was based upon residues observed in crop commodities treated according to label directions 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 dry peas, dry beans and tree nuts from crop group 14-11.

Table A1 Summary of Field Trial Data Used to Support the MRLs

Commodity
Application method/Total application rate
(kg a.e./ha)Table A1 Footnote 1
Preharvest interval
(days)
Lowest average field trial residuesTable A1 Footnote 2,Table A1 Footnote 3
(ppm)
Highest average field trial residuesTable A1 Footnote 2,Table A1 Footnote 3
(ppm)
Dry pea seed Soil preplant + broadcast foliar preharvest / 2.48–5.05 7 0.77 4.76
Dry lentil seed Soil preplant + broadcast foliar preharvest / 6.68–6.97 6–7 0.42 6.34
Dry bean seed Soil preplant + broadcast foliar preharvest / 4.98–5.96 7 ˂0.10 6.13
Almond nutmeat Soil-directed preharvest / 8.9 3 ˂0.10 0.63
Pecan nutmeat ˂0.10 0.20
Walnut nutmeat ˂0.11 0.74

Following the review of all available data, MRLs as proposed in Table 1 are recommended to cover residues of glyphosate and AMPA (expressed in parent equivalents). Residues of glyphosate and AMPA 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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