Proposed Maximum Residue Limit PMRL2015-20, Tembotrione


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Pest Management Regulatory Agency
June 23 2015
ISSN: 1925-0843 (PDF version)
Catalogue number: H113-24/2015-20E-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 globe artichoke, peanuts and the green onion subgroup (Crop Subgroup 3-07B) to the product label of DuPont Coragen Insecticide, containing technical grade chlorantraniliprole, is acceptable. The specific uses approved in Canada are detailed on the label of DuPont Coragen Insecticide, Pest Control Products Act Registration Number 31721.

The evaluation of this tembotrione application indicated that the end - use product has merit and value , and the human he alth 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 accordi ng 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 is made from it.

Consultation on the proposed MRL for tembotrione is being conducted via this document (see Next Steps, the last section of this document). A summary of the field trial data used to support the proposed MRL can be found in Appendix I. The currently established MRLs of 0.08 ppm in/on field corn and 0.04 pp m in/on sweet corn kernels plus cob with husks removed for isoxadifen - ethyl are sufficient to cover residues resulting from these new uses and are therefore unaffected by this MRL action.

To comply with Canada's international trade obligations, consultatio n 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 replace the MRL already established for tembotrione, is as follows.

Table 1 Proposed Maximum Residue Limit for Tembotrione
Common Name Residue Definition MRL (ppm)Table 1 footnote 1 Food Commodity
Table 1 footnote 1

ppm = parts per million

Return to table 1 footnote 2 referrer

Table 1 footnote 1

The current tembotrione residue definition for all commodities is captured as " 2 - [2 - chloro - 4 - (methylsulfonyl) - 3 - [(2,2,2 - trifluoroethoxy)methyl]benzoyl] - 1,3 - cyclohexanedione, including the metabolite 2 - [2 - chloro - 4 - (methylsulfonyl) - 3 - [2,2,2 - trifluoroethoxy)methyl]benzoyl] - 4,6 - dihydroxycyclohexane - 1,3 - di one" . T he MRL of 0.01 ppm for residues of tembotrione only is proposed to replace the established MRL of 0. 04 p p m for the combined residues of tembotrione and the metabolite 2 - [2 - chloro - 4 - (methylsulfonyl) - 3 - [2,2,2 - trifluoroethoxy)methyl]benzoyl] - 4,6 - dihydr oxycyclohexane - 1,3 - dione for sweet corn kernels plus cob with husks removed. The MRL of 0.04 ppm for imported sweet corn was based on residue data from sweet corn field trials conducted at a total exaggerated rate of 182 - 190 g a.i/ha.

Return to table 1 footnote 1 referrer

Tembotrione 2- [2 - chloro - 4 - (methylsulfonyl) - 3 - [(2,2,2 - trifluoroethoxy)methyl]benzoyl] - 1,3 - cyclohexanedione 0.01Table 1 footnote 2 Sweet corn kernels plus cob with husks removed

Proposed Maximum Residue Limit - PMRL201 5 - 20 Page 2 MRLs established in Canada may be found using the Maximum Residue Limit Database on the Maximum Residue Li mits 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 tembotrione 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 is no Codex MRL 1 listed for tembotrione in or on any commodity on the Codex Alimentarius Pesticide Residues in Food webpage.

Next Steps

The PMRA invites the public to submit written comments on the proposed MRLs for tembotrione 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 tembotrione in sweet corn were submitted to support the domestic use of the new end - use product Laudis Herbicide containing the registered technical grade active ingredient tembotrione.

Maximum Residue Limits

The recommendation for maximum residue limits (MRLs) for chlorantraniliprole 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 MRLs for globe artichokes, peanuts, dried green onions and green onion subgroup 3-07B.

Table A1 Summary of Field Trial Data Used to Support the Maximum Residue Limits (MRLs)
Commodity Application Method;
Total Application Rate
(g a.i./ha)Table A1 footnote 1
Preharvest Interval
Maximum Residues 2 (ppm) Minimum Residues 2 (ppm) Experimental Processing Factor
Table A1 footnote 1

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

Return to table 1 footnote 1 referrer

Table A1 footnote 2

Tembotrione only.

Return to table 1 footnote 2 referrer

Sweet corn kernels plus cob with husks removed ingle Foliar broadcast application/ 89 - 96 36-70 <0.01 <0.01 Not applicable

No increase to the dietary burden of livestock is expected when field and sweet corn are treated according to the approved label of Laudis Herbicide.

Following the review of all available data, the MRL as proposed in Table 1 is recommended to cover residues of tembotrione. Residues of tembotrione in field corn and sweet corn at the proposed and established MRL s will not pose an unacceptable risk to any segment of the population, including infants, child ren, adults and senior

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