No, DE won't work, you would want something with an insecticide. I think the product that folks in Canada use is this spray:Thanks! You mean diatomaceous earth dusting powder, is that correct? I have some food-grade DE that I could try.
https://www.drugs.com/vet/doktor-doom-lice-killer-for-poultry-plus-commercial-can.html
Unfortunately, I don't think that insecticide powders are easy to find in Canada. But if you want to look, look for something with permethrin, pyrethrins, or maybe carbaryl, though I don't think carbaryl is as effective as permethrin.
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