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alder flea beetle
aphid management
apple and thorn skeletonizer
apple ermine moth
ash whitefly new
azalea bark scale
azalea lace bug
bark lice
Barypeithes root weevil Updated
Beneficial nematodes
biocontrol of root weevils
birch aphid Updated
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
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 aphids Updated
maple tip moth
maple midge
March flies Updated
mountain ash sawfly
Narcissus bulb fly Updated
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
pine and cone spittlebug New
poplar and willow borer
rose curculio weevil
rose midge
sequoia pitch moth
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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Honeylocust plant bug

Honeylocust plant bug, Blepharidopterus (Diaphnocoris) chlorionis, is a relatively new pest in Oregon. It's presence in Oregon was confirmed in 2008. It has likely escaped detection for several years due to the cryptic coloration of the nymphs and adults which allow them to blend into the green of the foliage and stems. At this time they have been found in landscape settings. They may become a pest in nursery production but current management of honeylocust pod gall midge may also be managing this new pest.

There is one generation of this insect which overwinters as eggs. Activity begins with bud expansion of honeylocust when the nymphs hatch (eclose) and begin to feed on new growth. This feeding can cause stippling and growth distortion. Adults can be found about a month after nymphs appear and they also feed on new growth.

Heavy feeding can cause defioliation and in severe cases, can cause defoliation. Research by Herms et. al. found that defoliation was consistently highest on the cultivated variety, 'Moraine'. Older landscape trees often handle the feeding damage with only cosmetic damage. Younger nursery stock may show the distorted leaflet damage for much of the season.

Chemical control timing is focused on the newly expanding buds. Nymphs in the early season can be dislodged with high pressure water sprays. Horticultural oils and insecticidal soap are also used against the young nymphs. For additional chemical control information, check the Chemical Control of Nursery Pests section of the PNW Insect Management Handbook.

Web resources:

Penn State Cooperative Extension Entomological Notes: Honeylocust plant bug

Kyle, J. and J. Hahn. Ash and Honeylocust plant bug. University of Minnesota Pests of Trees and Shrubs. <26 April 2016>


Herms et al. 1987. Impact of Honeylocust Plant Bug (Heteroptera: Miridae) on Ornamental Honeylocust and Associated Adult Buprestids. Environmental Entomology, Volume 16, Number 4, August 1987 , pp. 996-1000(5).


Orginal publication: 7-1-2008
Latest update: 4-26-2016

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


Honeylocust plant bug damage
honeylocust plant bug damage
Honeylocust plant bug damage
honeylocust plant bug damage on leaf
Honeylocust plant bug adult
honeylocust plant bug adult
Honeylocust plant bug adult
honeylocust plant bug
Honeylocust plant bug nymph
honeylocust plant bug nymph
Website editor:
Robin Rosetta

Page last modified 4/26/16


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