Proposed Maximum Residue Limit PMRL2021-08, Rimsulfuron

Notice to the reader:

The online consultation is now closed.

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 grapes to the product label of Prism SG Herbicide, containing technical grade rimsulfuron, is acceptable. The specific use approved in Canada is detailed on the label of Prism SG Herbicide, Pest Control Products Act Registration Number 30057.

The evaluation of this rimsulfuron application indicated that the end-use product has value and the human health and environmental risks associated with the new use 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 rimsulfuron 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 the Canada's Notification Authority and Enquiry Point.

The proposed MRL, to be added to the MRLs already established for rimsulfuron, is as follows.

Table 1 Proposed maximum residue limit for rimsulfuron
Common name Residue definition MRL
(ppm)Table 1 Footnote 1
Food commodity
Rimsulfuron N-[[(4,6-dimethoxy-2-pyrimidinyl)amino]carbonyl]-3-(ethylsulfonyl)-2-pyridinesulfonamide 0.01 Small fruits vine climbing, except fuzzy kiwifruit (crop subgroup 13-07F, except gooseberries)Table 1 Footnote 2

MRLs are proposed for each commodity included in the listed crop grouping in accordance with the Residue Chemistry Crop Groups webpage in the Pesticides section of the website.

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 rimsulfuron 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 rimsulfuron 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 rimsulfuron 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 for rimsulfuron in grapes were submitted to support the domestic use of Prism SG Herbicide on grapes.

Maximum residue limit

The recommendation for the maximum residue limit (MRL) for rimsulfuron 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 small fruits vine climbing, except fuzzy kiwifruit (crop subgroup 13-07F, except gooseberries).

Table A1 Summary of field trial data used to support the MRL
Commodity Application method/Total application rate
(g a.i./ha)Table 2 Footnote 1
Preharvest interval
Lowest average field trial residues
Highest average field trial residues
Experimental processing factor
Grapes Soil-directed spray/
13–14 <0.01 <0.01 No quantifiable residues observed at exaggerated rates

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

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