Question for the Hive Mind: Cereus peruvianus blotches

Bad news would be good news on this one. I've had two large Cereus peruvianus since 2004, and they did really well for me for quite a long time, tripling in height the first year and then growing more slowly thereafter. Never any problems, until they got mealybugs a couple years ago. I fought and cursed and agonized over the mealybugs for a good solid year and a half, at least, before finally

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