Rhododendron (Rhododendron)-Azalea bark scale

Eriococcus azaleae

See:

Pest description and crop damage White, cottony sacs enclosing small, reddish eggs.

Management-chemical control

See:

For more information

Johnson, W.T. and H.H. Lyon (1991), Insects That Feed on Trees and Shrubs, 2nd ed., Cornell University Press (p. 336).

PNW Nursery IPM: Azalea Bark Scale (https://agsci.oregonstate.edu/nurspest/insects/azalea-bark-scale)