Thanks for writing. It sounds as though you might have mealybugs or snow scale. There are a couple of ways to treat them --- you can try a systemic insecticide, which is absorbed by the plant and makes it poisonous. Or you can use an insecticidal soap or neem-oil-based spray and spray your plant once a week or so for four consecutive weeks to kill all generations of this pest.
---Justin, Senior Garden Editor, BHG.com