Proposed Maximum Residue Limit PMRL2020-32, Trinexapac‑ethyl

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Pest Management Regulatory Agency
2 October 2020
ISSN: 1925-0843 (PDF version)
Catalogue number: H113-24/2020-32E-PDF (PDF version)

Under the authority of the Pest Control Products Act, Health Canada’s Pest Management Regulatory Agency (PMRA) has received applications to register technical grade trinexapac-ethyl and the end-use product Moddus for use in Canada on wheat, barley and oats.

The evaluation of these trinexapac-ethyl applications indicated that the end-use product has value, and the human health and environmental risks associated with their proposed uses are acceptable. Details regarding these applications can be found in Proposed Registration Decision PRD2020-13, Trinexapac-ethyl, posted to the website on 9 September 2020.

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 specified 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 MRLs for trinexapac-ethyl is being conducted via PRD2020-13. Information regarding the proposed MRLs can be found in Sections 3.6 and 7.1. Supporting field trial residue data are also provided in the PRD. The PMRA invites the public to submit written comments on the proposed MRLs for trinexapac-ethyl in accordance with the guidance found in PRD2020-13.

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 for trinexapac-ethyl are as follows.

Table 1: Proposed Maximum Residue Limit for trinexapac-ethyl
Common name Residue definitionTable 1: Tablenote 1 MRL (ppm)Table 1: Tablenote 2 Food commodity

Metabolite 4-[cyclopropyl(hydroxy)methylidene]-3,5-dioxocyclohexane-1-carboxylic acid

4.0 Wheat bran
3.0 Barley, oats, wheat
0.02 Meat byproducts of cattle, goats, hogs, horses, poultry and sheep
0.01 Eggs; fat and meat of cattle, goats, hogs, horses, poultry and sheep; milk

Table 1: Tablenote 1

Table 1: Tablenote 1

The residue definition for trinexapac-ethyl is the metabolite trinexapac acid.

Return to Table 1: Footnote 1 referrer

Table 1: Tablenote 2

ppm = parts per million

Return to Table 1: Footnote 2 referrer

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. For livestock commodities, differences in MRLs can also be due to different livestock feed items and practices.

Table 2 compares the MRLs proposed for trinexapac-ethyl in Canada with corresponding American tolerances and Codex MRLsFootnote 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 (where different)
Food commodity Canadian MRL (ppm) American Tolerance (ppm) Codex MRL
Wheat bran 4.0 6.0 8

Barley, oats, wheat

3.0 4.0 (wheat and oats grain)
2.0 (barley grain)
Meat byproducts of cattle, goats, hogs, horses, poultry, and sheep 0.02 0.03 (meat byproducts of hogs)
0.04 (meat byproducts of cattle, goats, horses and sheep)
0.005 (milks)
0.01 (eggs; mammalian fats (except milk fats); meat (from mammals other than marine mammals); poultry fats; poultry meat)
0.05 (edible offal of poultry)
0.1 (edible offal of mammals)
Eggs; fat and meat of cattle, goats, hogs, horses, poultry and sheep; milk 0.01 0.02 (fat and meat of cattle, goats, hogs, horses and sheep)

Next steps

The PMRA invites the public to submit written comments on the proposed MRLs for trinexapac-ethyl 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.

Following the review of all available data, MRLs as proposed in Table 1 is recommended to cover residues of halauxifen-methyl. Residues of halauxifen-methyl in these crop commodities 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.

Return to footnote 1 referrer

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