Willow Flea Weevil and Imported Willow Leaf Beetle: Identification and Control

Willow Flea Weevil and Imported Willow Leaf Beetle: Identification and Control

Round, black, 3/16-inch insects eating weeping willow leaves, with matching bumps on foliage, indicate willow flea weevil and/or imported willow leaf beetle. Both cause browning, premature leaf drop, and reduced vigor from mid-summer onward.

Life Cycle & Damage

• Adults: Tiny black weevils with orange legs; chew circular holes from leaf undersides (mid-May to July).
• Eggs: Laid in leaf punctures by late June.
• Larvae: Mine inside leaves, creating brown, blister-like blotches (mid-August completion).
• Overwinter: Adults in soil, sod, loose bark.

Chemical Control

• Apply bifenthrin, chlorpyrifos, or pyrethrin as shade-tree spray.
• Timing: Early June (1–11) after leaves flatten; second application early July (1–4) for new growth.
• Follow label rates for shade tree pests.

Cultural Notes

• Healthy trees tolerate moderate defoliation.
• Rake and destroy fallen leaves to reduce overwintering population.

Consistent early-season treatment prevents severe damage.