Mealybugs are similar to scale insects; however, they secrete a white waxy material over their bodies. Mealybugs also move about on the host plant to feed. Mealybugs are most susceptible to insecticide applications when they are young and have not formed a thick covering over their bodies.
Photo by: James Morgan
Control options
Select plant material that is not prone to scale infestation. Inspect plants frequently. Look for lady beetles and other beneficial insect populations associated with scale infestation. Prune heavily infested plant parts when possible.
Treat infested plants with insecticidal oils during the dormant season or with conventional sprays in spring and summer when young crawlers are actively moving on the plant. Application should cover both sides of leaves and all twigs and branches. Some products labeled for scale control include malathion, acephate (Orthene), carbaryl (Sevin), bifenthrin, cyfluthrin, insecticidal soaps and horticultural oils.
Source
https://secure.caes.uga.edu/extension/publications/files/pdf/B%201074_7.PDF