Cottonwood (Populus)-Azalea bark scale

Eriococcus azaleae

Pest description and damage Immature 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 adults beneath the wax are red. Hosts include andromeda, azalea, rhododendron, hawthorn, poplar, willow, and most recently, blueberry in the Pacific Northwest.

For biology, life history, scouting, and management options


See "Scale insect" in:

Management-chemical control

See Table 1 in: