Imported Willow Leaf Beetle: Look for 2nd Generation
Larvae
Bug Bytes
Authors
Joe Boggs
Published on
July 4, 2016
Second generation larvae of the imported willow leaf beetles (Plagiodera versicolora) are
munching the leaves of wild and cultivated willows in southwest Ohio. This native of northern
Europe was first found in the U.S. in 1915. Since that time, it has become well established
throughout most of the eastern and Midwestern states. This beetle has a history of periodically
achieving population outbreak densities and causing significant defoliation of its namesake host
in Ohio.
The shiny bluish-black or bluish-green adult beetles chew holes or notches in willow leaves.
The tapered bluish-black larvae skeletonize leaves and typically cause more damage than the
adults. Young larvae may feed side by side and move as a group across the upper or lower leaf
surfaces. Heavy infestations cause leaves to turn brown and appear scorched.
Imported Willow Leaf Beetle Adult and Larval Damage
Damage caused by the beetle can become significant since two or three generations may occur
in Ohio. Standard insecticides labeled for willow are effective in managing this pest, as well as
insecticidal soap sprays if applied to the larvae.
Tags
Willow
Imported Willow Leaf Beetle