Proposed Maximum Residue Limit PMRL2020-14, Myclobutanil

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Pest Management Regulatory Agency
29 July 2020
ISSN: 1925-0843 (PDF version)
Catalogue number: H113-24/2020-14E-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 greenhouse eggplants and globe artichokes to the product label of Nova Fungicide, containing technical grade myclobutanil, is acceptable. The specific uses approved in Canada are detailed on the label of Nova Fungicide, Pest Control Products Act Registration Number 22399.

The evaluation of these myclobutanil applications 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 MRLs for myclobutanil 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 the Canada’s Notification Authority and Enquiry Point.

The proposed MRLs, to be added to the MRLs already established for myclobutanil, are as follows.

Table 1. Proposed maximum residue limits for myclobutanil
Common name	Residue definition	MRL (ppm)^{Footnote 1}	Food commodity
Myclobutanil	α-butyl-α-(4-chlorophenyl)-1H-1,2,4-triazole-1-propanenitrile, including the metabolites α-(3-hydroxybutyl)-α-(4-chlorophenyl)-1H-1,2,4-triazole-1-propanenitrile and α-(butyl-3-one)-α-(4-chlorophenyl)-1H-1,2,4-triazole-1-propanenitrile	1.0	African eggplants, eggplants, pea eggplants, scarlet eggplants
Myclobutanil		0.9	Globe artichokes
Footnote 1 of Table 1 ppm = parts per million Return to first footnote 1 referrer of Table 1

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.

Table 2 compares the MRLs proposed for myclobutanil in Canada with corresponding American tolerances and Codex MRLs^{Footnote 1} . American tolerances are listed in the Electronic Code of Federal Regulations, 40 CFR Part 180, by pesticide. A listing of established Codex MRLs is available on the Codex Alimentarius Index des pesticides 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 (ppm)
African eggplants, eggplants, pea eggplants, scarlet eggplants	1.0	4.0 Vegetable, fruiting, (group 8) except tomato	Not established
Têtes d’artichaut	0.9	0.9	Not established

Next steps

The PMRA invites the public to submit written comments on the proposed MRLs for myclobutanil 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 myclobutanil in globe artichokes were submitted to support the domestic use of Nova Fungicide on globe artichokes. Previously reviewed residue data from field trials conducted in/on greenhouse peppers were reassessed in the framework of this petition. Peppers are the representative crops for crop subgroup 8-09B, of which eggplant is a member. As such, residue data for peppers was extended to eggplant.

Maximum residue limits

The recommendation for maximum residue limits (MRLs) for myclobutanil 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 African eggplants, eggplants, pea eggplants, scarlet eggplants, and globe artichokes.

Table A1. Summary of field trial data used to support MRLs
Commodity	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)
Greenhouse peppers	Foliar/420	3	0.42	< 0.61
Globe artichokes	Foliar/ 662–667	3	< 0.50	< 0.77
Footnote 1 of Table 1 g a.i./ha = grams of active ingredient per hectare Return to first footnote 1 referrer of Table 1

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