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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
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