Proposed Maximum Residue Limit PMRL2016-67, Teflubenzuron

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Pest Management Regulatory Agency
16 November 2016
ISSN: 1925-0843 (PDF version)
Catalogue number: H113-24/2016-67E-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 teflubenzuron on various commodities to permit the import and sale of foods containing such residues.

Teflubenzuron is an insecticide 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 teflubenzuron 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 teflubenzuron 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 for teflubenzuron are as follows.

Table 1: Proposed Maximum Residue Limits for Teflubenzuron
Common Name Residue Definition MRL (ppm)Table 1 footnote 1 Food Commodity
Teflubenzuron N-[[(3,5-dichloro-2,4-difluorophenyl)amino]carbonyl]-2,6-difluorobenzamide 70 Citrus oil
1.5 Mangos, tomatoes
0.8 Pineapples
0.6 Green coffee beans, oranges
0.5 Papayas
0.3 Sunflower seeds
0.2 Broccoli
0.05 Dry soybeans
0.02 Corn oil (refined)
0.01 Cauliflowers, field corn
Table 1 footnote 1

ppm = parts per million

Return to table 1 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 MRLs proposed for teflubenzuron in Canada are the same as corresponding American tolerances as listed in the Electronic Code of Federal Regulations, 40 CFR Part 180, by pesticide, except for citrus oil. Currently, there are no Codex MRLsFootnote 1 listed for teflubenzuron in or on the specified commodities on the Codex Alimentarius Pesticide Residues in Food and Feed webpage.

Table 2: Comparison of Canadian MRLs and American Tolerances (where different)
Food Commodity Canadian MRL
American Tolerance
Citrus oil 70 100

Next Steps

The PMRA invites the public to submit written comments on the proposed MRLs for teflubenzuron 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 teflubenzuron were submitted to support the maximum residue limits on imported broccoli, cauliflowers, dry soybeans, tomatoes, oranges, field corn, sunflower seeds, papayas, pineapples, mangos, and green coffee beans. In addition, processing studies in treated dry soybeans, tomatoes, oranges, field corn, sunflower seeds, and green coffee beans were reviewed to determine the potential for concentration of residues of teflubenzuron into processed commodities.

Maximum Residue Limits

The recommendation for maximum residue limits (MRLs) for teflubenzuron was based upon the residues observed in crop commodities treated according to label directions at exaggerated rates 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 broccoli, cauliflowers, dry soybeans, tomatoes, oranges, field corn, sunflower seeds, papayas, pineapples, mangos, and green coffee beans.

Table A1: Summary of Field Trial and Processing Data Used to Support MRLs
Commodity Application Method/ Total Application Rate
(g a.i./ha)Table A1 footnote 1
Preharvest Interval (days) Lowest Average Field Trial Residues
Highest Average Field Trial Residues
Experimental Processing Factor
Broccoli Foliar broadcast
13-17 <0.01 0.07 -
Cauliflowers Foliar broadcast
20-21 <0.01 <0.01 -
Dry soybeans Foliar broadcast
21 <0.01 0.034 -
Tomatoes Foliar broadcast
3 0.07 0.88 -
Oranges Foliar broadcast
21-35 0.02 0.26 Citrus oil (257-fold)
Field corn Foliar broadcast
30 <0.01 <0.01 Corn oil (refined) (1.7-fold)
Sunflower seeds Foliar broadcast
7-15 <0.01 0.126 -
Papayas Foliar broadcast
14 0.041 0.194 -
Pineapples Foliar broadcast
7-15 0.037 0.476 -
Mangos Foliar broadcast
7-15 0.297 0.506 -
Green coffee beans Foliar broadcast
30-35 <0.01 0.292 -
Table A1 footnote 1

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

Return to table A1 footnote 1 referrer

Following the review of all available data, MRLs as proposed in Table 1 are recommended to cover residues of teflubenzuron. Residues of teflubenzuron 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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