I have magnolia scale. I've attached a photo of how they looked last spring, but they were the brown waxy this fall. I sprayed during the time the crawlers came out, but I'm sure I didn't get everything directly sprayed due to foliage. I'm wondering (hoping) the recent ridiculously cold snap may kill many since I've heard emerald ash borers may die @ -30. Is there any hope they'll be killed off, or do I still need to poison again this spring? I don't like spraying due to the problems with bees......