Nancy

Honestly nothing works really efficiently, but we've had some luck protecting our blueberries with realistic owl figures - unfortunately bluejays are in that group of birds that includes crows -the Corvids, that are extremely intelligent, so they rapidly learn whether something is a real threat or not.  The second thing that has worked temporarily are fluttering reflective strips of tape or wrapping paper, something shiny and waterproof. The trick is to rotate your "scare" items because they do learn rapidly The commercial blueberry growers near us just let them have their fill  but of course they have acres of bushes! Good luck.