How to Manage Pests
Pests in Gardens and Landscapes
Poplar and willow borer—Cryptorhynchus lapathi
The poplar and willow borer is an atypical weevil occurring
throughout most of the United States. Adults are 7.5 to
10 mm long, mostly black, and densely covered with dark bristles.
The mostly pale larvae develop
through six instars. All stages can occur year round and
it can take up to three years to complete one generation.
Adult weevils chew bark and oviposit on current-year
green shoots. Larvae chew mines 1 to 3 inches long beneath
and in bark and in wood. Terminals die back and fine brown
boring dust may be seen around entrances.
Prune and dispose of infested and dying limbs
or trees. Treatment may be warranted with a persistent insecticide
to control adults when active and when infestations are heavy.
and willow borer adult
and willow borer adult (left) larva in wood (right)