Proposed Maximum Residue Limit PMRL2018-28, Diethofencarb

Notice to the reader:

This consultation is now closed.

Pest Management Regulatory Agency
21 August 2018
ISSN: 1925-0843 (PDF version)
Catalogue number: H113-24/2018-28E-PDF (PDF version)

Under the authority of the Pest Control Products Act, Health Canada’s Pest Management Regulatory Agency (PMRA) is proposing to establish a maximum residue limit (MRL) for diethofencarb on bananas to permit the import and sale of foods containing such residues.

Diethofencarb is a fungicide not currently registered for use in Canada.

The PMRA must determine the quantity of residues that are likely to remain in or on the imported food commodities when diethofencarb 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 MRL for diethofencarb 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.

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 Canada’s Notification Authority and Enquiry Point.

The proposed MRL for diethofencarb is as follows.

Table 1. Proposed Maximum Residue Limit for Diethofencarb

Common Name

Residue Definition

MRL (ppm)Footnote 1

Food Commodity


1-methylethyl N-(3,4-diethoxyphenyl)carbamate



Footnote 1

ppm = parts per million

Return to footnote 1 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

The MRL proposed for diethofencarb 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 diethofencarb in or on any commodity on the Codex Alimentarius Pesticide Index webpage.

Next Steps

The PMRA invites the public to submit written comments on the proposed MRL for diethofencarb 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 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 Limit

Residue data from Costa Rica, Ecuador, Guatemala, and Honduras for diethofencarb in bananas were submitted to support the maximum residue limit on imported bananas.

Maximum Residue Limit

The recommendation for the maximum residue limit (MRL) for diethofencarb was based upon the residues observed in crop commodities treated according to label directions  in the exporting countries, and the guidance provided in the OECD MRL Calculator. Table A1 summarizes the residue data used to calculate the proposed MRL for imported bananas.

Table A1. Summary of Field Trial Data Used to Support the MRL


Application Method/ Total Application Rate (g a.i./ha)Footnote 1

Preharvest Interval (days)

Lowest Average Field Trial Residues (ppm)

Highest Average Field Trial Residues (ppm)


Foliar Application / 1178-1209




Footnote 1

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

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Following the review of all available data, the MRL as proposed in Table 1 is recommended to cover residues of diethofencarb. Residues of diethofencarb in imported bananas 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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