Mealie bug! I just battled these. I sprayed any active bugs w/ 70 percent isopropyl alcohol and treated all plants with an imidacloprid drench. I used Bonide Tree and Shrub (1.47 percent imidacloprid) at 2 tbsp per gallon. At least 3 treatments over 2-3 weeks, maybe more, and you will keep seeing mealies until it takes effect (or at least I did).