Q. My Viburnum had mites in June -- what to do?
Mites on a Viburnum can be treated with a miticide or horticultural oil. Use the highly refined version of the oil in summer. Bug-be-gone is an insecticide and is not labeled for mites.
You can apply the oil in late winter, covering all sides of the stems. In summer cover both sides of the leaves and all sides of the stems.