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Battled scale for a few years myself, pine scale. Oils and scrape them off at first sight is your best bet to eradicate them. Also a clean pair of clothing is key to not reintroduce them.
I ve been all over this site for a few years now and you are the the 1st bunch to address these geeks. They are soo gross i hate them. I would go and crush them by hand just to be rid of them. I blamed not filtering my seabird guano. Had them before ants. When ants moved in they totally put the scale to work, them and mealybugs.