Insects on rhododendron

These insects are all over one of my rhodos. Are they harmful? If so, how can I get rid of them?

Could be a species of robber fly. Possibly Eudioctria nitida. The larvae live in the soil and adults emerge in spring. We have seen them come out of the soil around one of our hostas which resides under a tall rhodo. The larvae eat insects in the soil and the adults hunt other flies. One of the beneficials, I believe.

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