A province does have its own registration process however, and can effectively ban the use of a pesticide in its own jurisdiction even though it has been approved in Ottawa. This happened in the case of 2,4,5 -T, which had been banned in the U.S., Sweden and many other countries, but was registered for use in Canada by the federal government. In the early 1980's the provinces of Ontario, Saskatchewan and Quebec made independent decisions not to allow its use in those provinces. We can answer that question with a categorical No. Over and over, those pushing pesticides will defend them by claiming that the federal registration is a guarantee of safety.
Pesticide regulation is all about balancing the risks of their use with their economic benefit.
All too often, chemicals will stay in use because government decides that the economic benefit outweighs the human health risk. Once a chemical is registered for use in Canada, it is extremely difficult to get it banned. Governments are slow to take action. Unfortunately, governments act as though chemicals have constitutional rights and must be presumed innocent until proven guilty. When the environment and human health are at stake, chemicals should be presumed guilty until proven innocent.