Proposed Maximum Residue Limit PMRL2019-34, Bentazon
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Pest Management Regulatory Agency
26 November 2019
Catalogue number: H113-24/2019-34E-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 alfalfa to the product labels of VIPER ADV containing technical grade bentazon and imazamox and BASAGRAN FORTE HERBICIDE, containing technical grade bentazon are acceptable. The specific uses approved in Canada are detailed on the labels of VIPER ADV and BASAGRAN FORTE HERBICIDE, Pest Control Products Act Registration Numbers30626 and 22006, respectively.
The evaluation of these applications indicated that the end-use products have 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 bentazon 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. Residues of imazamox from these uses are covered by MRLs currently established for imazamox in animal commodities.
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 bentazon, are as follows.
|Common Name||Residue Definition||MRL (ppm)Footnote 1||Food Commodity|
|Bentazon||3-(1-methylethyl)-1H-2,1,3-benzothiadiazin-4(3H)-one 2,2-dioxide, including the metabolites 6-hydroxy-3-(1-methylethyl)-1H-2,1,3-benzothiadiazin-4(3H)-one 2,2-dioxide and 8-hydroxy-3-(1-methylethyl)-1H-2,1,3-benzothiadiazin-4(3H)-one 2,2-dioxide||0.4||Meat by products of cattle, goats, horses, and sheep|
|0.06||Kidney of poultry|
|0.05||Eggs; fat and meat of cattle, goats, hogs, horses, and sheep; fat, meat, and meat by products of poultry (except kidney); meat by products of hogs|
MRLs established in Canada may be found using the Maximum Residue Limit Database on the Maximum Residue Limits for Pesticides web page. 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. For livestock commodities, differences in MRLs can also be due to different livestock feed items and practices.
Table 2 compares the MRLs proposed for bentazon 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 Pesticide Index web page, by pesticide or commodity.
|Food Commodity||Canadian MRL (ppm)||American Tolerance (ppm)||Codex MRL (ppm)|
|Meat by products of cattle, goats, horses, and sheep||0.4||0.05||Not established|
|Kidney of poultry||0.06||0.05||0.07 (Poultry, edible offal of)|
|Fat and meat of cattle, goats, hogs, horses, and sheep; meat by products of hogs; fat, meat, and meat by products of poultry (except kidney)||0.05||0.05||0.03 (Poultry meat) 0.07 (Poultry, edible offal of)|
The PMRA invites the public to submit written comments on the proposed MRLs for bentazon 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.
Summary of Field Trial Data Used to Support the Proposed Maximum Residue Limits
Residue data for bentazon in alfalfa were submitted to support the maximum residue limits on animal commodities. In addition, animal metabolism studies were re-assessed in the context of this petition.
Maximum Residue Limits
The recommendation for maximum residue limits (MRLs) for bentazon was based upon the submitted field trial data and the calculation of the dietary burden and anticipated residues in animal commodities. Table A1 summarizes the alfalfa residue data reviewed in the context of this submission.
|Commodity||Application Method/Total Application Rate
(g a.i./ha)Footnote 1
|Preharvest Interval (days)||Lowest Average Field Trial Residues
|Highest Average Field Trial Residues
|Alfalfa forage||Foliar broadcast/1404-1542||18-23||<1.47||<10.2|
|Alfalfa hay||Foliar broadcast/1404-1542||18-23||<3.96||<32.6|
Following the review of all available data, MRLs as proposed in Table 1 are recommended to cover residues of bentazon. Residues of bentazon in animal commodities at the proposed MRLs 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.
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