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 cherry aphids 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
carnation tortrix 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
Japanese beetle new
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
Psyllopsis fraxinicola updated
rose curculio weevil
rose midge
rove beetle gallery new
sequoia pitch moth
soldier beetle galleryn 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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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.

Original version: <27 September 2005)

Last revision <29 November 2016>

Author: R.L. Rosetta, Extension Nursery Integrated Pest Management, Department of Horticulture, Oregon State University/NWREC.


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

Page last modified 11/29/16


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