dropped leaves on willow

Suddenly a 5 yr old corkscrew willow has no leaves. Adjacent trees are fine. Could it be a beetle?
Submitted by BHGPhotoContest

If it is a beetle defoliating the tree, you should see evidence of the beetle. There may be some of the veins of the leaves left as skeletons, or there may be insect frass from their feeding. There are leaf beetles that feed on willow and can cause defoliation. Other causes of defoliation would likely leave fallen yellow leaves as evidence.

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