Rhododendron (Rhododendron)-Azalea bark scale

Eriococcus azaleae

Pest description and damage The immature scales superficially resemble mealybugs in appearance. Mature female scales are about 0.125 inch in length and appear like white cottony sacs, often located on twigs and stems of azalea, especially in branch axils. Eggs, crawlers, and female scales under the white cotton are red.

For biology, life history, monitoring and management

See:

Azalea (Rhododendron)-Azalea bark scale

See "Scale insect" in:

Common Landscape Pests

Management-chemical control

See Table 1 in:

Chemical Control of Landscape Pests