Pesticide possession is federally regulated. That is to say, that you can possess even the pesticides that the provincial government has banned. The provincial ban addresses the “sale and use” of pesticides. While your neighbor may possess banned pesticides, it would be against the law for him to apply them in Manitoba. That being said, Manitoba Conservation has absolutely no intention of setting up a snitch line and would very much like to discourage homeowners from tying up the 411 line to inform on their neighbours.