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
borers
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
caterpillars

Ceanothus stem gall moth
cereal leaf beetle
cherry ermine moth
chilli thrips
cinnabar moth
clay colored weevil
cottony camellia scale
cutworm
craneflies
cypress tip moth
updated
dogwood sawfly
Douglas fir sawfly
Douglas fir twig weevil
dustywings new
earwigs
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
lacebugs
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
roseslug
rove beetle gallery new
sawflies
scale
sequoia pitch moth
soldier beetle galleryn new
snakefly gallery new
speckled green fruitworm
meadow spittlebug updated
tent caterpillars
thrips
viburnum leaf beetle
violet gall midge
western poplar clearwing
western spotted cucumber beetle
white pine weevil updated
whiteflies
woolly ash aphid
woolly beech aphid updated

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Pacific flatheaded borer

Damage from the Pacific flatheaded borer, Chrysobothris mali, often can be seen in late August and September in shade tree production. The following images were taken during August of flatheaded borer damage and larvae on cherry and plum trees. Adult borers emerge from late May-June and are ported to fly for about one month.

Generally insecticides are not recommended for this pest in nursery production. Rather growers rogue out and burn thoroughly infested material. Try to determine the cause of stress to the trees. Drought stress, sunburn, root anoxia are some of the underlying factors making trees susceptible to flatheaded borer damage.

 

Oregon State University Pacific flatheaded borer fact sheet

Forest Pests of North America: Pacific flatheaded borer

Original version: <2 September 2003)

Last update <29 December 2016>

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

Sawdust or frass from wound on cherry
borer frass
Frass and weeping on plum
borer frass on plum
More subtle frass evidence on plum
frass on plum
Weeping wound on cherry
weeping damage

Multiple Pacific flatheaded borer larvae in cherry
Multiple Pacific flatheaded borer larvae in cherry

Closeup of Pacific flatheaded borer larvae and galleries in cherry
Pacific flatheaded borer larvae and galleries in cherry
Pacific flatheaded borer larva
flatheaded borer larva
Pacific flatheaded borer adult
Pacific flatheaded borer adult
Photo: Ken Gray

Pacific flatheaded borer larva

Website editor:
Robin Rosetta

Page last modified 12/29/16

 

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