T-4- 94 - Plant Growth Regulators

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September 1997

This memorandum gives clarification on the status of products with growth regulator claims.

Plant growth regulators may be subject to the authority of either the Fertilizers Act or the Pest Control Products (PCP) Act, or both, depending upon the interpretation of the definitions in the two acts.

Fertilizers Act, Section 2

Supplement means any substance or mixture of substances, other than a fertilizer, manufactured, sold or represented for use in the improvement of the physical condition of soils or to aid plant growth or crop yields.

Pest Control Products Act, Section 2

Pest means any injurious, noxious or troublesome insect, fungus, bacterial organism, virus, weed, rodent or other plant or animal pest, and includes any injurious or troublesome organic function of a plant or animal.

Supplements, subject to the authority of the Fertilizers Act, are products that claim to aid crop yields. They include, but are not limited to, products that:

  • enhance root or vegetative development;
  • break dormancy;
  • induce early germination or sprouting;
  • condition soil;
  • contain vitamins with growth regulating properties.

Pest control products, subject to the authority of the Pest Control Products Act, are those products that claim to limit plant development or modify physiological, morphological or reproductive processes other than those within the meaning of supplement. They include, but are not limited to, products that:

  • inhibit sprouting or germination;
  • set fruit;
  • control suckers;
  • enhance color;
  • defoliate;
  • control pre-harvest drop;
  • affect ripening;
  • effect fruit thinning.

Applications for evaluation and registration of products with pest control claims only will be reviewed by the Pest Management Regulatory Agency (PMRA) for purposes of the Pest Control Products Act and registered as prescribed.

Applications for evaluation and registration of products with supplement claims only will be reviewed in the Fertilizer Section for purposes of the Fertilizers Act and registered as prescribed.

Products containing only growth regulators, which carry mixed claims, are subject to registration under the Pest Control Products Act contingent upon acceptance of the supplement claims under the Fertilizers Act. All other products with mixed claims are subject to registration under the Fertilizers Act.

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