Pacific flatheaded borer

alder flea beetle
aphid management
apple and thorn skeletonizer
apple ermine moth
azaleae bark scale
Barypeithes root weevil
Beneficial nematodes
black stem borer
branch and twig borer
brown marmorated stink bug
bronze birch borer
boxwood leafminer
boxwood psyllid
caterpillars UPDATED
Ceanothus stem gall moth
cherry ermine moth
clay colored weevil
craneflies
cypress tip moth
dogwood sawfly New
Douglas fir twig weevil
earwigs
elm leafminer
European pine shoot moth
European shot-hole borer
emerald ash borer
Fall webworm NEW
flatheaded cedar borer
honeylocust pod gall midge
huckleberry root aphids
ground mealybug
lacebugs
leaf weevil
maple tip moth
maple midge
March flies
spruce aphid on spruce
obscure root weevil
Pacific flatheaded borer
pear leaf-curling midge
pine needle scale
poplar and willow borer
rose curculio weevil
rose midge
roseslug
sawflies
scale NEW
sequoia pitch moth
spittlebug
tent caterpillars NEW
thrips
viburnum leaf beetle
western poplar clearwing
western spotted cucumber beetle
white pine weevil NEW
whiteflies
woolly ash aphid

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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