3/9/2016 12:03 PM
Upstate of SC, we have dealt with some kind on small black wasps that forage over bunkers for years, though usually in summer. Never sting, no nesting, just a nuisance and scares the golfers. I haven't been able to control them.
If it is Cicada Killers (definitely earlier than I have seen them), I have had really good results with foaming insecticides sold for carpenter bees. The can comes with a red tube like WD40...shoot it into the hole in am or late pm (they return to the nest where they are attempting to lay eggs on wasps they have caught). Just let it foam to the top of the hole and they are toast. Beware, the product will smoke turf if you are on a green.