Proposed Maximum Residue Limit PMRL2019-08, Ferbam, Thiram and Ziram

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Pest Management Regulatory Agency
3 May 2019
ISSN: 1925-0843 (PDF version)
Catalogue number: H113-24/2019-8E-PDF (PDF version)

Under the authority of the Pest Control Products Act, Health Canada's Pest Management Regulatory Agency (PMRA) recommended cancellation of all food uses of ferbam and ziram in Canada; and granted continued registration of products containing thiram for sale and use in Canada. The only food uses supported for thiram are the seed treatment uses.

Before registering a pesticide for food use in Canada or allowing continued registration, 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 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 made from it.

Ferbam

The dietary assessment for ferbam was published in the PRVD2016-05. Based on the comments received through the consultation process, the dietary risk assessment was revised. In the final re-evaluation decision for ferbam (RVD2018-37), human health risks were identified for all uses. Therefore, all established MRLs for ferbam are proposed for revocation.

Ziram

The dietary assessment for ziram was published in the PRVD2016-06. Based on the comments received through the consultation process, the dietary risk assessment was revised. In the final re-evaluation decision for ziram (RVD2018-39), human health risks were identified for all food uses. Therefore, all established MRLs for ziram are proposed for revocation.

Thiram

The dietary assessment for thiram was published in the PRVD2016-07. Based on the comments received through the consultation process, the dietary risk assessment was revised. In the final re-evaluation decision for thiram (RVD2018-38), no human health risks were identified for the seed treatment uses on barley, bean, beet, broccoli, Brussels sprout, cabbage, canola, cantaloupe, carrot, cauliflower, celery, corn, cucumber, eggplant, flax, lentil, lettuce, mustard, oat, onion, pea, pepper, pumpkin, radish, rapeseed, rye, safflower, soybean, spinach, squash, sugar beet, tomato, triticale, turnip, watermelon, and wheat. Potential residues from these seed treatment uses will continue to be regulated under subsection B.15.002(1) of the Food and Drug Regulations, which requires that residues not exceed 0.1 ppm. For all other food uses, human health risks of concern were identified. Therefore, all established MRLs for thiram are proposed for revocation.

Following the revocation of ferbam, ziram and thiram MRLs, all crops will be regulated under subsection B.15.002(1) of the Food and Drug Regulations, which requires that residues not exceed 0.1 ppm. Consultation on the revocation of these MRLs is being conducted via this document.

To comply with Canada's international trade obligations, consultation on the revocation of MRLs is also being conducted internationally by notifying the World Trade Organization, as coordinated by Canada's Notification Authority and Enquiry Point.

International Situation and Trade Implications

To mitigate human health risks associated with all food uses, except the thiram seed treatment uses, all ferbam, ziram and thiram MRLs are proposed for revocation. Table 1, Table 2 and Table 3 compare the MRLs to be revoked in Canada, for ferbam, ziram and thiram uses respectively, with corresponding American tolerances and Codex MRLs.

American tolerances are listed inthe Electronic Code of Federal Regulations, 40 CFR Part 180, by pesticide, and a listing of established Codex MRLs is available on the Codex Alimentarius Pesticide Index webpage, by pesticide or commodity.

Table 1. Comparison of Canadian MRLs, American Tolerances and Codex MRLs (where different) - for Ferbam
Food Commodity Canadian MRL American Tolerance (ppm) Codex MRL (ppm)
Footnote 1

Following the revocation of the MRLs, all crops will be regulated under subsection B.15.002(1) of the Food and Drug Regulations, which requires that residues not exceed 0.1 ppm.

Return to footnote 1 referrer

Apples Revoked 7 ppm MRLFootnote 1 4.0 5
(Pome fruits)
Apricots Revoked 7 ppm MRLFootnote 1 Not established 7
(Stone fruits)
Asparagus Revoked 7 ppm MRLFootnote 1 Not established 0.1
Bulb onions Revoked 7 ppm MRLFootnote 1 Not established 0.5
Cabbages Revoked 7 ppm MRLFootnote 1 None (revoked 10/27/07) 5
Carrot roots Revoked 7 ppm MRLFootnote 1 Not established 1
Cherries Revoked 7 ppm MRLFootnote 1 4.0 0.2
Collards Revoked 7 ppm MRLFootnote 1 Not established 15
Cranberries Revoked 7 ppm MRLFootnote 1 4.0 5
Cucumbers Revoked 7 ppm MRLFootnote 1 Not established 2
Currants Revoked 7 ppm MRLFootnote 1 Not established 10
Grapes Revoked 7 ppm MRLFootnote 1 4.0 5
Kales Revoked 7 ppm MRLFootnote 1 Not established 15
Lettuce Revoked 7 ppm MRLFootnote 1 None (revoked 10/27/07) 0.5 (Head lettuce)
10 (Cos lettuce)
Mangoes Revoked 7 ppm MRLFootnote 1 4.0 2
Melons Revoked 7 ppm MRLFootnote 1 Not established 0.5 (Melons, except watermelon)
1 (Watermelon)
Nectarines Revoked 7 ppm MRLFootnote 1 4.0 7
(Stone fruits)
Papayas Revoked 7 ppm MRLFootnote 1 Not established 5
Peaches Revoked 7 ppm MRLFootnote 1 4.0 7
(Stone fruits)
Peanuts Revoked 7 ppm MRLFootnote 1 Not established 0.1
Pears Revoked 7 ppm MRLFootnote 1 4.0 5
(Pome fruits)
Peppers Revoked 7 ppm MRLFootnote 1 Not established 1
(Sweet peppers)
Plums Revoked 7 ppm MRLFootnote 1 Not established 7
(Stone fruits)
Pumpkins Revoked 7 ppm MRLFootnote 1 Not established 0.2
Quinces Revoked 7 ppm MRLFootnote 1 Not established 5
(Pome fruits)
Squash Revoked 7 ppm MRLFootnote 1 Not established 1 (Summer squash)
0.1 (Winter squash)
Strawberries Revoked 7 ppm MRLFootnote 1 Not established 5
Sweet corn Revoked 7 ppm MRLFootnote 1 Not established 0.1
Tomatoes Revoked 7 ppm MRLFootnote 1 Not established 2
Comparison of Canadian MRLs, American Tolerances and Codex MRLs (where different) - for Ziram
Food Commodity Canadian MRL American Tolerance (ppm) Codex MRL (ppm)
Footnote 1

Following the revocation of the MRLs, all crops will be regulated under subsection B.15.002(1) of the Food and Drug Regulations, which requires that residues not exceed 0.1 ppm.

Return to footnote 1 referrer

Apples Revoked 7 ppm MRLFootnote 1 7.0 5
(Pome fruits)
Apricots Revoked 7 ppm MRLFootnote 1 7.0 7
(Stone fruits)
Blueberries Revoked 7 ppm MRLFootnote 1 7.0 Not established
Bulb onions Revoked 7 ppm MRLFootnote 1 Not established 0.5
Cabbages Revoked 7 ppm MRLFootnote 1 Not established 5
Carrot roots Revoked 7 ppm MRLFootnote 1 Not established 1
Cherries Revoked 7 ppm MRLFootnote 1 7.0 0.2
Collards Revoked 7 ppm MRLFootnote 1 Not established 15
Cranberries Revoked 7 ppm MRLFootnote 1 Not established 5
Cucumbers Revoked 7 ppm MRLFootnote 1 Not established 2
Grapes Revoked 7 ppm MRLFootnote 1 7.0 5
Huckleberries Revoked 7 ppm MRLFootnote 1 7.0 Not established
Kales Revoked 7 ppm MRLFootnote 1 Not established 15
Lettuce Revoked 7 ppm MRLFootnote 1 Not established 0.5 (Head lettuce)
10 (Cos lettuce)
Melons Revoked 7 ppm MRLFootnote 1 Not established 0.5 (Melons, except watermelon)
1 (Watermelon)
Nectarines Revoked 7 ppm MRLFootnote 1 7.0 7
(Stone fruits)
Peaches Revoked 7 ppm MRLFootnote 1 7.0 7
(Stone fruits)
Peanuts Revoked 7 ppm MRLFootnote 1 Not established 0.1
Pears Revoked 7 ppm MRLFootnote 1 7.0 5
(Pome fruits)
Peppers Revoked 7 ppm MRLFootnote 1 Not established 1
(Sweet peppers)
Pumpkins Revoked 7 ppm MRLFootnote 1 Not established 0.2
Quinces Revoked 7 ppm MRLFootnote 1 7.0 5
(Pome fruits)
Squash Revoked 7 ppm MRLFootnote 1 Not established 1 (Summer squash)
0.1 (Winter squash)
Strawberries Revoked 7 ppm MRLFootnote 1 7.0 5
Tomatoes Revoked 7 ppm MRLFootnote 1 7.0 2
Table 3. Comparison of Canadian MRLs, American Tolerances and Codex MRLs (where different) - for Thiram
Food Commodity Canadian MRL American Tolerance (ppm) Codex MRL (ppm)
Footnote 1

Following the revocation of the MRLs, all crops will be regulated under subsection B.15.002(1) of the Food and Drug Regulations, which requires that residues not exceed 0.1 ppm.

Return to footnote 1 referrer

Apples Revoked 7 ppm MRLFootnote 1 5.0 5
(Pome fruits)
Bananas Revoked 1 ppm MRLFootnote 1 2.0 2
Nectarines Revoked 7 ppm MRLFootnote 1 7.0 7
(Stone fruits)
Peaches Revoked 7 ppm MRLFootnote 1 7.0 7
(Stone fruits)
Strawberries Revoked 7 ppm MRLFootnote 1 13 5
Tomatoes Revoked 7 ppm MRLFootnote 1 Not established 2

Next Steps

The PMRA invites the public to submit written comments on the proposed revocation of MRLs for ferbam, thiram and ziram 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 revocation of MRLs. Comments received will be addressed in a separate document linked to this PMRL. The revocation of MRLs will be legally in effect as of the date that they are removed from the Maximum Residue Limit Database. The revocation of MRLs will take effect to allow sufficient time for legally treated commodities to clear the channels of trade.

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