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