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 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
dustywings New
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
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
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
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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Bronze birch borer

The bronze birch borer, Agrilus anxius, is common east of the Cascades. Damage to trees can be severe, often deadly.

The presence of the bronze birch borer in the Portland metro area had been positively confirmed as of October 23, 2003. The population looks extensive, quite established and has killed trees in the Beaverton/Tigard area. This is in addition to a positive identification in Corvallis. This flatheaded beetle borer will likely increase its distribution in Western Oregon. It may be possible to slow the movement of this borer by good site selection and choice of more resistant birches, cultural habits, and proper management of existing infestations which may include chemical intervention or tree removal. If you know landscapers in the area, please let them be alert to this.

The following websites offer more information regarding its life cycle, damage, and management.

University of Illinois Extension Bug Review: Bronze Birch Borer. This site is nice for having both English and Spanish language versions of their fact sheet.

University of Minnesota Extension: The Bronze Birch Borer and Its Management
This has a nice chart listing the resistance of birch trees susceptibility to bronze birch borer.

Purdue Ornamentals and Turf: Bronze birch borer

USDA - Forest Service Forest Insect and Disease Leaflet - Bronze Birch Borer A nicely presented leaflet with good diagrams of classification of borer damage stages in trees.

Orginal publication: 10/22/2008
Latest publication: 5/11/2016


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


Bronze birch borer adult
bronze birch borer adult
Bronze birch borer adult and emergence hole
bronze birch borer and emergence hole
Stained bark and emergence hole indicating bronze borer infestation
stained bark and emergence hole
Bronze birch borer galleries (bark removed)
bronze birch borer damage
Photo: Ken Gray
Website editor:
Robin Rosetta

Page last modified 5/11/16


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