Answer: First of all, congratulations on the appearance of beneficial insects in your garden! Usually when populations of bothersome insects soar, beneficial insects come to the rescue. I suspect that the soldier beetles are doing their share to help control the mites. If you want to release other beneficials, try lacewings. These guys will attack almost anything that moves! Or, you can treat the tree with insecticidal soap or a neem-based insecticide to control the mites. Routine misting with water also helps raise the humidity and control mites.
Hope you're successful in ridding your tree of mites!
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