Health Canada has completed the re-evaluation of plant growth regulator uniconazole-P. Under the authority of the Pest Control Products Act, Health Canada has determined that continued registration of products containing uniconazole-P is acceptable. An evaluation of available scientific information found that most uses of uniconazole-P products meet current standards for protection of human health and the environment when used according to revised label directions which include new mitigation measures.

To protect workers entering treated areas from occupational exposure, the following risk-reduction measures and label updates are required:
– Cancellation of uniconazole-P use on greenhouse ornamentals grown for cut flowers.
– Clarifications on the required personal protective equipment for workers mixing/loading and applying uniconazole-P.
– Specifying that the use of handheld mist blowers/airblast or handheld fogging equipment is not allowed.

Any person may file a notice of objection regarding this decision on uniconazole-P within 60 days from the date of publication of this Re-evaluation Decision (February 3). For more information regarding the basis for objecting (which must be based on scientific grounds), please refer to the Pesticides section of the website (Request a Reconsideration of Decision) or contact the PMRA’s Pest Management Information Service by phone (1-800-267-6315) or by e-mail (