If you have a local Agriculture Dept near you maybe they could give you the phone number of a person who knows how to remove the bees for you without killing the bees. Since the bees may be honeybees, the person may be interested in them to keep. There are ways to remove bees without harming your trees or the bees. Don't use insecticide on them as we need all the bees we can get right now due to the mysterious empty hive disease going around. Please give them a call.