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 Updated
bark lice
Barypeithes root weevil
Beneficial nematodes
biocontrol of root weevils
birch aphid
black stem borer
bluegum psyllid
branch and twig borer
brown marmorated stink bug

bronze birch borer
boxwood leafminer
boxwood psyllid Updated
bulb flies
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
cutworm Updated
cypress tip moth

dogwood sawfly
Douglas fir sawfly
Douglas fir twig weevil
elm leafminer
European pine shoot moth
European wool carder bee
emerald ash borer
Fall webworm
flatheaded cedar borer
hollyhock weevil
honeylocust plant bug
honeylocust pod gall midge
Heliothis phloxiphaga
holly bud moth
huckleberry root aphids
ground mealybug
lady beetle gallery
leaf weevil
light brown apple moth
maple tip moth
maple midge
March flies
mountain ash sawfly
spruce aphid on spruce
oak ambrosia beetle
oak slug
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
poplar and willow borer
rose curculio weevil
rose midge
sequoia pitch moth
speckled green fruitworm
tent caterpillars
viburnum leaf beetle
violet gall midge
western poplar clearwing
western spotted cucumber beetle
white pine weevil Updated
woolly ash aphid

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Apple and thorn skeletonizer

The apple and thorn skeletonizer, Choreutis pariana, can be found feeding on several host plants grown in Pacific Northwest nurseries. Hosts include apple, birch, crabapple, cherry, hawthorn, willow, and mountain ash. A recent infestation on crabapple highlighted feeding preferences. "Snowdrift' and 'Spring Snow' were obviously preferred hosts, and to a lesser degree, Malus floribunda.

The eggs are laid on the leaf underside near the midrib. Developing larvae feed on underleaves. They move to the upper side of the leaf, tying the edges together and feeding there until they pupate. It is reported to overwinter as a pupa in the Pacific Northwest.

Damage consists of skeletonization of the leaf, best seen holding the leaf toward light.


Johnson, W. T. and H. H. Lyon. 1991. Insects that Feed on Trees and Shrubs. 2nd Ed. Cornell University Press. Itaca, NY.


WSU Extension Insect Answers: Apple and thorn skeletonizer.

Great photos of the adult moth at this Swedish website.

Another nice adult shot at this UK website.

And from the Electronic Journal of Polish Universities, information on the skeletonizer and its parasitoids.


Apple and thorn skeletonizer larvae, silk, and feces
apple and thorn skeletonizer larvae and feces
Photo: Kirin Elliot
Leaf webbing and larva of skeletonizer on crabapple.
apple and thorn skeletonizer larva and webbing
Photo: Rosetta
apple and thorn skeletonizer pupal case
Photo: Kirin Elliot
Skeletonized leaf damage on crabapple - view from underneath.
skeletonizer damage
Photo: Rosetta
Skeletonized crabapple leaf.
skeletonized leaf
Photo: Rosetta
Crabapple branch damage from the skeletonizer.
branch damage
Photo: Rosetta
Damage on crabapple in field - note brown leaves.
field damage
Photo: Rosetta
Website editor:
Robin Rosetta

Page last modified 9/27/05


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