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
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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Psyllopsis fraxinicola

There is a new pest of ash trees in Oregon, Psyllopsis fraxinicola. This psyllid is a recent introduction to Oregon. It was first identified in 2008 in Portland. It has since been confirmed from Salem, Sherwood, and Tigard but likely has a greater geographic distribution.

This species of psyllid is reported from the Palearctic region and more recently introduced into North and South America, Australia, and Servia. Host plants include several ash species (Faxinus excelsior, F. angustifolia).

There are two generations per year. Eggs are at the base of the terminal leaf buds, along leaf veins, and on bark. Hatch is likely to occur in late May or early June in Oregon. There are five instars of the nymphs. The first two instars are yellow with red eyes. The third and fourth instars are green. The last instar is green with pink eyes and reddish wing buds. There is not local data yet but adults can be found June through October in Britain.Overwintering eggs are laid near the beginning of August (Jerinic-Prodanovic et al., 2007).

Damage shows up as curling of young leaves. Heavy feeding may result in chlorosis, necrosis, and general decline in the affected tree.

There are reported natural enemies including Anthocoris nemoralis, a predatory bug. The author has noted lady beetle eggs laid near a colony of the psyllid as well. Encyrtid wasps are parasites of this species.

Online Resources:

Bristish Bugs: Psyllopsis fraxinicola

Jerinic-Prodanovic, D. et al. 2007. Psyllopsis fraxinicola Foerster (Homoptera: Psyllidae), a new ash tree pest in Serbia. Pesticidi i fitomedicina. v. 22(1) p. 51-57. [Serbian. Abstract in English]

Noyes, J. and P. Hanson. 1996. Encrytidae (Hymenoptera: Chaldidoidea) of Costa Rica: the genera and species associated with the jumping plant lice (Homoptera: Psylloidea). Bull. Nat. His. Mus. Lond. Ent 65(2):105-164

Original version: <8 June 2011)

Last revision <19 December 2016>

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

Damage from P. fraxinicola-note curled leaves due to psyllid feeding

Psyllopsis fraxinicola nymph
Psyllopsis fraxinicola nymph
P. fraxinicola nymphs feeding along the vein
Psyllopsis fraxinicola nymphs feeding along vein
P. fraxinicola nymphs with wax
Psyllopsis fraxinicola nymphs with wax

P. fraxinicola nymph with wax
Psyllopsis fraxinicola nymph with wax covering


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Robin Rosetta

Page last modified 12/19/16


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