Registration Decision RD2015-20, Mono- and Di Potassium Salts of Phosphorus Acid
Pest Management Regulatory Agency
23 November 2015
ISSN: 1925-0940 (PDF version)
Catalogue number: H113-25/2015-20E-PDF (PDF version)
Registration Decision for Mono and Di-Potassium Salts of Phosphorus Acid
Health Canada's Pest Management Regulatory Agency (PMRA), under the authority of the Pest Control Products Act and Regulations, is granting full registration for the sale and use of Winfield Phosphite TGAI and Confine Extra Fungicide, containing the technical grade active ingredient mono- and di-potassium salts of phosphorous acid, to suppress oomycete diseases on a range of crops and ornamentals in greenhouses.
An evaluation of available scientific information found that, under the approved conditions of use, the product has value and does not present an unacceptable risk to human health or the environment.
These products were first proposed for registration of the greenhouse uses in the consultation documentFootnote 1 Proposed Registration Decision PRD2015-16,Mono- and Di-Potassium Salts of Phosphorous Acid. This Registration DecisionFootnote 2 describes this stage of the PMRA's regulatory process for mono- and di-potassium salts of phosphorous acid and summarizes the Agency's decision and the reasons for it. The PMRA received no comments on PRD2015-16. This decision is consistent with the proposed registration decision stated in PRD2015-16.
For more details on the information presented in this Registration Decision, please refer to the Proposed Registration Decision PRD2015-16, Mono- and Di-Potassium Salts of Phosphorous Acid that contains a detailed evaluation of the information submitted in support of this registration.
What Does Health Canada Consider When Making a Registration Decision?
The key objective of the Pest Control Products Act is to prevent unacceptable risks to people and the environment from the use of pest control products. Health or environmental risk is considered acceptableFootnote 3 if there is reasonable certainty that no harm to human health, future generations or the environment will result from use or exposure to the product under its conditions of registration. The Act also requires that products have valueFootnote 4 when used according to label directions. Conditions of registration may include special precautionary measures on the product label to further reduce risk.
To reach its decisions, the PMRA applies modern, rigorous risk-assessment methods and policies. These methods consider the unique characteristics of sensitive subpopulations in humans (for example, children) as well as organisms in the environment. These methods and policies also consider the nature of the effects observed and the uncertainties when predicting the impact of pesticides. For more information on how the PMRA regulates pesticides, the assessment process and risk-reduction programs, please visit the Pesticides and Pest Management portion of Health Canada's website at healthcanada.gc.ca/pmra.
What is Are Mono- and Di-Potassium Salts of Phosphorus Acid?
Mono- and di-potassium salts of phosphorous acid is a fungicide active ingredient classified as a phosphonate and used in Confine Extra Fungicide to suppress oomycete diseases on a wide range of crops.
Can Approved Uses of Mono- and Di-Potassium Salts of Phosphorus Acid Affect Human Health?
Mono- and di-potassium salts of phosphorous acid is unlikely to affect human health when used according to label directions.
Exposure to mono- and di-potassium salts of phosphorous acid may occur when handling and applying the product. When assessing health risks, two key factors are considered: the levels where no health effects occur and the levels to which people may be exposed. Only uses for which the exposure is well below levels that cause no effects in animal testing are considered acceptable for registration.
Mono- and di-potassium salts of phosphorous acid is of low toxicity by the oral, dermal and inhalation routes, and minimally irritating to the eyes. The available information suggests that it is unlikely to have any short-term or prenatal developmental effects, as well as any significant genotoxic effects. The precautionary label statement indicating that contact with skin, eyes, and clothing must be avoided, and the personal protective equipment statement that applicators and other handlers must wear a long-sleeved shirt, long pants, gloves, shoes plus socks, and protective eyewear are effective mitigative measures to reduce the risk associated with the use of mono- and di-potassium salts of phosphorous acid.
Risks in Residential and Other Non-Occupational Environments
Risk to people from residential and other non-occupational environments is not expected as the new use is for greenhouse application and mono- and di-potassium salts of phosphorous acid has low toxicity.
Occupational Risks From Handling Confine Extra Fungicide
Occupational risks are not of concern when Confine Extra Fungicide is used according to the label directions, which include protective measures.
Precautionary (for example, wearing of personal protective equipment) and hygiene statements on the label are considered adequate to protect individuals from occupational exposure. Since the application is done in a greenhouse by commercial applicators, exposure to bystanders is expected to be negligible.
Residues in Water and Food
Dietary risks from food and water are not of concern.
Dietary risk to humans is considered negligible based on a long history of use and the low toxicity of the end use product. The available literature suggests that there is no toxicological concern from ingestion of the end-use product residues.
It is anticipated that the uses of mono- and di-potassium salts of phosphorous acid in Canada on food crops will not pose a risk to any segment of the population, including infants, children, adults and seniors, from consumption of produce from treated crops. The end-use product is registered for field uses in Canada for suppression of downy mildew and phytophthora diseases on potatoes, fruiting vegetables, blueberries, strawberries, grapes, brassicas, cucurbits, and leafy vegetables. PMRA did not specify maximum residue limits (MRLs) for mono- and di-potassium salts of phosphorous acid for the registered field uses.
No risk due to exposure from drinking water is anticipated as the end-use product is proposed for greenhouse application.
What Happens When Mono- and Di-Potassium Salts of Phosphorus Acid Is Introduced Into the Environment?
Mono- and di-potassium salts of phosphorous acid is not expected to pose an unacceptable risk to the environment when used according to label directions as a fungicide in a greenhouse.
Mono- and di-potassium salts of phosphorous acid can enter the environment when used as a foliar-spray fungicide for food and non-food crops in greenhouses in Confine Extra Fungicide. Overall inputs to soil and water are considered to be less than the currently registered agricultural applications of this pesticide (i.e. field crops).
Mono- and di-potassium salts of phosphorous acid is not expected to pose an unacceptable risk to non-target terrestrial and aquatic species from use in greenhouses. This is based on the low toxicity to tested organisms and because environmental exposure is expected to be limited from use in greenhouses.
What Is the Value of Confine Extra Fungicide on Greenhouse Tomatoes, Peppers, Cucumbers, Lettuce, Basil and Ornamentals?
Confine Extra Fungicide is a non-conventional fungicide with systemic properties that suppress major oomycete diseases, including downy mildews, on a wide range of crops. This product also poses a low risk of pest resistance development.
These characteristics make Confine Extra Fungicide a valuable option for integration into pest management practices. Potassium phosphite is identified as a high priority by Canadian growers for use against downy mildew on greenhouse cucumbers.
Measures to Minimize Risk
Registered pesticide product labels include specific instructions for use. Directions include risk-reduction measures to protect human and environmental health. These directions must be followed by law.
The key risk-reduction measures on the label of Confine Extra Fungicide to address the potential risks identified in this assessment are as follows:
Key Risk-Reduction Measures
To ensure bystander protection and mitigate postapplication exposure of workers, the end-use product label is required to include the precautionary statements, "Keep unprotected persons out of the treated areas in a greenhouse for the duration of the treatment period" and "Allow entry or re-entry to greenhouse only after thorough ventilation and spray mist has cleared and the treated surface has dried."
Precautionary label statements that are required for all commercial products will be needed. No other mitigative measures are necessary.
The relevant test data on which the decision is based (as referenced in PRD2015-16,Mono- and Di-Potassium Salts of Phosphorous Acid) are available for public inspection, upon application, in the PMRA's Reading Room (located in Ottawa). For more information, please contact the PMRA's Pest Management Information Service by phone (1-800-267-6315) or by e-mail (firstname.lastname@example.org).
Any person may file a notice of objectionFootnote 5 regarding this registration decision within 60 days from the date of publication of this Registration Decision. For more information regarding the basis for objecting (which must be based on scientific grounds), please refer to the Pesticides and Pest Management portion of the Health Canada's website (Request a Reconsideration of Decision) or contact the PMRA's Pest Management Information Service.
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