Eriococcus azaleae
Pest description and damage This scale superficially resemble mealybugs in appearance. Mature female scale are about 0.125 inch long and appear like white cottony sacs, often located on twigs and stems of azalea, especially in branch axils. Eggs, crawlers, and the insects under the wax scale are red.
For biology, life history, monitoring and management
See:
Azalea (Rhododendron)-Azalea bark scale
Management-chemical control
See Table 1 in: