Contents: By Damage and Image
(In progress)
Contents: Alphabetical
alder flea beetle
aphid management
apple and thorn skeletonizer
apple ermine moth
ash whitefly New
azalea bark scale
azalea lace bug
azalea sawfly New
bark lice
Barypeithes root weevil Updated
Beneficial nematodes
biocontrol of root weevils
birch aphid Updated
black bean aphid New
black stem borer
bluegum psyllid
branch and twig borer
brown marmorated stink bug

bronze birch borer
boxwood leafminer
boxwood psyllid Updated
bulb flies
cabbage whitefly new
carpet beetle (images)
Calligraph californica

Ceanothus stem gall moth
cereal leaf beetle
cherry ermine moth
chilli thrips
cinnabar moth
clay colored weevil
cottony camellia scale
cypress tip moth

dogwood sawfly
Douglas fir sawfly
Douglas fir twig weevil
dustywings New
elm leafminer
European pine shoot moth
European wool carder bee
emerald ash borer
Fall webworm
flatheaded cedar borer
ground beetle gallery New
hollyhock weevil
honeylocust plant bug
honeylocust pod gall midge
Heliothis phloxiphaga
holly bud moth
huckleberry root aphids
ground mealybug
lacewings New
lady beetle gallery Updated
leaf weevil
light brown apple moth
maple aphids Updated
maple tip moth
maple midge
March flies Updated
mountain ash sawfly
Narcissus bulb fly Updated
Natural enemies gallery new
spruce twig aphid
oak ambrosia beetle
oak slug
oak twig gall wasp new
obscure root weevil
Pacific flatheaded borer
peach tree borer
peach twig borer
pear blight beetle Updated
pear psylla
pear leaf-curling midge
pear sawfly
pine needle scale
pine and cone spittlebug New
poplar and willow borer
rose curculio weevil
rose midge
rove beetle gallery New
sequoia pitch moth
soldier beetle gallery New
snakefly gallery New
speckled green fruitworm
meadow spittlebug updated
tent caterpillars
viburnum leaf beetle
violet gall midge
western poplar clearwing
western spotted cucumber beetle
white pine weevil Updated
woolly ash aphid
woolly beech aphid Updated

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Azaleae bark scale

The azaleae bark scale, Eriococcus azaleae Comstock, can be found on a variety of hosts grown in nurseries and landscapes including azaleae, rhododendron, andromeda, hawthorn, poplar, willow, and most recently, it has been found infesting blueberries in the Pacific northwest. It can be found on bark and stems and has a woolly or cottony appearance.

It is reported to have one generation a year in Connecticut but may have two generations in warmer climates such as the south. The overwintering females lay eggs under the scale in the spring. The eggs hatch in the late spring/early summer and the young crawlers disperse and soon settle, mostly in bark crevices, branch crotches, and but also onto new growth and leaves. In 2006 crawlers were captured on double-sided sticky tape place on June 9 and read on June 12.

Azaleae bark scale on blueberry
azaleae bark scale on blueberries
Photo: Wei Yang
Azaleae bark scale on blueberry closeup
closeup of azaleae bark scale on blueberry
Photo: USDA-Natural Resources Conservation Service.
Azaleae bark scale in leaf axil
scale in leaf axil
Photo: Rosetta
Exposed eggs under scale shell
scale eggs under scale
Photo: Joe DeFrancesco
Closeup of scale eggs
closeup of scale eggs
Photo: Rosetta
Closeup of scale eggs
closeup of scale eggs
Photo: Rosetta
Double-sided sticky tape with crawlers (note large numbers of crawlers near arrows)
double-sided sticky tape with scale crawlers
Photo: Rosetta
Double-sided sticky tape with crawlers
azaleae bark scale crawlers
Photo: Rosetta
Close-up of crawlers
close-up of crawlers in tape
Photo: Rosetta
Close-up of crawler stuck in tape
azaleae bark scale crawler
Photo: Rosetta
Website editor:
Robin Rosetta

Page last modified 7/6/06


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