Answer: It would really help to collect a few of the bugs so they can be identified and you can use a product safe for your viburnum but death to the bugs. Collect them in a plastic baggie and take them to your cooperative extension office or well staffed nursery for positive identification. If your viburnum is otherwise healthy it should develop new leaves to replace those lost to the bug infestation. Give it a few weeks to recover. If you don't see any new growth in a few weeks, prune it back a little to encourage new growth. As long as the roots are healthy you should see healthy new stems and leaves later this summer. Hope so!
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