In January 2025, the Pest Management Regulatory Agency (PMRA) announced that the implementation timeline for the updated tank mix labelling policy had been delayed until December 20, 2025.

Beyond that date, in order for tank mixing to be permitted, there must be text on each product label that specifically allows for tank mixing. This text may be in one of two forms: a specific mention of the tank mix partners or the general label statement that permits tank mixing. 

For example: This product may be tank mixed with a fertilizer, a supplement, or with registered pest control products, whose labels also allow tank mixing, provided the entirety of both labels, including Directions For Use, Precautions, Restrictions, Environmental Precautions, and Spray Buffer Zones, are followed for each product. In cases where these requirements differ between the tank mix partner labels, the most restrictive label must be followed. Do not tank mix products containing the same active ingredient unless specifically listed on this label.

For more detail, consult: 

https://www.canada.ca/content/dam/hc-sc/documents/services/consumer-product-safety/reports-publications/pesticides-pest-management/policies-guidelines/tank-mix-labelling/tank-mix-labelling.pdf

Source: Grape Growers of Ontario November 28, 2025 newsletter