This bunker on the left side of #9 is filled with cicada killer wasp galleries daily. Every morning we tour the course with wasp spray and fill the wasp galleries with insecticide. Spraying into the galleries will sometimes eliminate adult wasps but will always reduce populations by aborting egg development.
The wasps won't sting people, they are however very aggressive. They also are seasonal and I believe the population will be peaking soon. Good news if you're a cicada or a wayward golfer.