Proposed Maximum Residue Limit PMRL2017-12, Oxyfluorfen

Pest Management Regulatory Agency
4 May 2017
ISSN: 1925-0843 (PDF version)
Catalogue number: H113-24/2017-12E-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 dry bulb shallots to the product label of Goal 2XL Herbicide Emulsifiable Concentrate, containing technical grade oxyfluorfen, is acceptable. The specific uses approved in Canada are detailed on the label of Goal 2XL Herbicide Emulsifiable Concentrate, Pest Control Products Act Registration Number 24913.

The evaluation of this oxyfluorfen 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 oxyfluorfen 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 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 oxyfluorfen, is as follows.

Table 1 - Proposed Maximum Residue Limits for Oxyfluorfen
Common Name Residue Definition MRL (ppm)Table 1 footnote 1 Food Commodity
Oxyfluorfen 2-chloro-1-(3-ethoxy-4-nitrophenoxy)-4- (trifluoromethyl)benzene 0.05 Shallot bulbs
Table 1 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

Currently there is no tolerance established for oxyfluorfen in or on shallot bulbs as listed in the Electronic Code of Federal Regulations, 40 CFR Part 180, by pesticide. Currently, there are no Codex MRLsFootnote 1.2listed for oxyfluorfen in or on any commodity on the Codex Alimentarius Pesticide Residues in Food and Feed website.

Next Steps

The PMRA invites the public to submit written comments on the proposed MRL for oxyfluorfen 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 on file for oxyfluorfen in dry bulb onions were reviewed to support the domestic use of Goal 2XL Herbicide Emulsifiable Concentrate on dry bulb shallots. In addition, previously reviewed residue data from field trials conducted in/on dry bulb onions were reassessed in the framework of this petition.

Maximum Residue Limits

The recommendation for maximum residue limits (MRL) for oxyfluorfen 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 shallot bulbs.

Table A1 - Summary of Field Trial Data Used to Support the MRL
Commodity Application Method / Total Application Rate (g a.i./ha)Table 1 footnote 1.1 Preharvest Interval (days) Lowest Average Field Trial Residues (ppm) Highest Average Field Trial Residues(ppm)
Dry bulb onions Foliar application
480-1120 105-112
26-109 <0.01 <0.01
Table 2 footnote 1

g a.i./ha = grams of active ingredient per hectare


Following the review of all available data, an MRL as proposed in Table 1 is recommended to cover residues of oxyfluorfen. Residues of oxyfluorfen in this crop at the proposed MRL will not pose an unacceptable risk to any segment of the population, including infants, children, adults and seniors.

Page details

Date modified: