Viburnum leaf beetle

Viburnum leaf beetle larvae skeletonize leaves in May and June, leaving only the upper leaf surface intact and creating a lacy appearance. Later, adults chew irregular holes in summer foliage (July to September). You will see small black egg-filled pits in viburnum twigs in fall. This invasive beetle occurs in King, Snohomish, Whatcom, and Skagit counties in western Washington.

Prune and destroy infested twigs in late fall when eggs are visible as black caps on branches. Severe infestations warrant removal of entire branches or even plants if spread to new areas. For new infestations, contact your county extension office. Parasitoid wasps and predatory beetles provide natural control over time. Do not use broad-spectrum pesticides.