Poplar (Populus)-Poplar-and-willow borer

Cryptorhyncus lapathi

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.

Management-cultural control

Keep trees vigorous.

Management-chemical control


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)