Contents: By Damage and Image
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Contents: Alphabetical

alder flea beetle
aphid management
apple and thorn skeletonizer
apple ermine moth
ash whitefly
azalea bark scale
azalea lace bug
azalea sawfly
Bagrada bug
bark lice
Barypeithes root weevil
Beneficial nematodes
biocontrol of root weevils
birch aphid
black bean aphid
black cherry aphids
black stem borer
bluegum psyllid
Boisduval scale
branch and twig borer
brown marmorated stink bug

bronze birch borer
boxwood leafminer
boxwood psyllid
bulb flies
cabbage whitefly
carnation tortrix
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

crane flies
cypress tip moth

dogwood sawfly
Douglas fir sawfly
Douglas fir twig weevil
elm leafminer
European pine sawfly new
European pine shoot moth
European wool carder bee
emerald ash borer
Fall webworm
fir coneworm new
flatheaded cedar borer
ground beetle gallery
Hemerocallis gall midge new
hollyhock weevil
honeylocust plant bug
honeylocust pod gall midge
Heliothis phloxiphaga
holly bud moth
huckleberry root aphids
ground mealybug
Japanese beetle
lady beetle gallery
leaf weevil
light brown apple moth
Linden aphid new
lupine aphid new
Macrosiphum rhamni new
maple aphids
maple tip moth
maple midge
March flies
mountain ash sawfly
Myzocallis sp. on red oak new
Narcissus bulb fly
natural enemies gallery
oak ambrosia beetle
oak slug
oak twig gall wasp
obscure root weevil
Pacific flatheaded borer
peach tree borer
peach twig borer
pear blight beetle
pear psylla
pear leaf-curling midge
pear sawfly
pine needle scale
pine and cone spittlebug
poplar and willow borer
Psyllopsis fraxinicola
rose curculio weevil
rose midge
rove beetle gallery
rose stem girdler
sequoia pitch moth
soldier beetle gallery
snapdragon plume moth new
snakefly gallery
speckled green fruitworm
meadow spittlebug
spotted asparagus beetle
spruce twig aphid
tent caterpillars
viburnum leaf beetle
violet gall midge
western poplar clearwing
western spotted cucumber beetle
white pine weevil
woolly alder aphid new
woolly ash aphid
woolly beech aphid

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Boxwood psyllid


Boxwood psyllid, Cacopsylla (=psylla) buxi (Linnaeus), is a common pest of boxwood, particularly in landscape settings.

Feeding by the nymphs and adults causes a characteristic cupping of the new growth. The nymphs produce a waxy secretion giving them a woolly appearance. Boxwood psylla damage is primarily aesthetic and generally will not affect the overall health of the plant.

There is one generation a year. Eggs are laid underneath the leaf bud scales. UMass Extension lists egg hatch occurring at 80 Growing Degree Day (GDD) with adults appearing around 300 GDD. The Ohio State University lists egg hatch at 179 GDD (base 50 degree F.). Eggs hatch (eclosure) was noted on April 2 in the North Willamette valley in 2010 (approx. 41 GDD), April 5 in the Portland metro area in 2007 (approx. 77 GDD). Adults were noted May 17 (approx. 229 GDD) in western Oregon in 2012. The Ohio State site indicates full bloom saucer magnolia, Magnolia soulangiana, and full bloom of weeping Higan cherry, Prunus subhirtella, as phenological indicator plants.


Cultural management options include pruning off infested tips prior to adult emergence and egg laying.

True bugs are the most numerous natural enemies of psyllids. Anthocoris amplicollis has been identified as a predator of boxwood psylla in Serbia (Jerinić-Prodanović D, Protić L., 2013). Although there is an array of natural enemies that feed on boxwood pysllid, they generally do not keep damage below commercial nursery thresholds.

Chemical management: Programs relying on "soft" insecticides such as insecticidal soap and horticultural oil time applications just as boxwood growth flushes in the spring to smother the eggs prior to hatch. This must occur before the nymphs feed enough to cause cupping of the leaves, after which they will be protected from these contact sprays. Growers also use systemic insecticides to target this pest, generally applying either in the fall or a couple of weeks before nymphal feeding is expected in the spring.

For more information and options for chemical control, check the link for Chemical Control of Nursery Pests at the PNW Insect Management Handbook.

True bugs are the most numerous natural enemies of psyllids. Anthocoris amplicollis has been identified as a predator of boxwood psylla in Serbia (Jerinić-Prodanović D, Protić L., 2013)

The following websites have information on boxwood psyllid.

Hoover, G. 2001. Penn State Entomology: Boxwood psyllid. November 2001. <accessed 9 March 2016>.

Jerinić-Prodanović D, Protić L. True bugs (Hemiptera, Heteroptera) as psyllid predators (Hemiptera, Psylloidea). ZooKeys. 2013;(319):169-189. doi:10.3897/zookeys.319.4316.

Townsend, L. 2011. Boxwood Psyllid. University of Kentucky Extension. <accessed 9 March 2016>. May 2011. <accessed 9 March 2016>.

University of California Pest Notes: Psyllids has information on a wide variety of psyllids, some of which might be helpful for boxwood psyllid management.<accessed 9 March 2016>.

Revised 9/March/2016

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


Damage from boxwood psyllid
boxwood psylla damage
Boxwood psyllid damage
boxwood pyslla damage
Boxwood psyllid damage
boxwood psylla damage
Waxy extrusions from boxwood psylla
waxy extrusions from boxwood psylla

Close-up of waxy extrusions from psylla
Waxy extrusions from boxwood psylla
Waxy extrusions of boxwood psylla
waxy extrusions of boxwood psylla

Boxwood psylla extruding wax
boxwood psylla extruding wax
Closeup of boxwood psyllid nymph extruding wax
boxwood psyllid nymph extruding wax
Boxwood psyllid adult
boxwoood psylla adult
Boxwood pysllid adult
boxwood psyllid adult

Boxwood psylla adult and nymph
boxwood psylla adult and nymph

Closeup of psyllid head
closeup of boxwood psyllid head
Boxwood psyllid nymph hatching (eclosing)
boxwood psyllid nymph hatching
Boxwood psyllid nymph and egg shells
boxwood psyllid nymph and egg shells
Boxwood psyllid nymph
boxwood psyllid nymph
Boxwood psyllid nymph
boxwood psylla nymph
Website editor:
Robin Rosetta

Page last modified 3/9/16


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