Pest description and crop damage Larvae bore under bark and into wood. They weaken and break limbs.
Scouting and thresholds Entry holes and borer damage greatly affect marketability; action thresholds are very low. Prevention is key.
Keep trees vigorous.
Chemical Control of Nursery Pests
Apply materials to the trunk and lower limbs. Avoid contacting foliage. Apply from mid-June to August, when adults are active.
For more information
Johnson, W.T. and H.H. Lyon (1991), Insects That Feed on Trees and Shrubs, 2nd ed., Cornell University Press (p. 268).
PNW Nursery IPM: Poplar-and-willow borer (http://oregonstate.edu/dept/nurspest/poplar_and_willow_borer.htm)