Pond Boss Forums GENERAL QUESTIONS Wildlife Management how to kill ground hornets,guinny wasps,yellow jac

I have done in 3 underground yellow jacket hives this year.

First - Find the nest.

I approach the nest and spray cheap foaming wasp spray you get at any big box store. This keeps them from coming after you but doesn't have any lasting affect.

Treat with a cup of bifenthrin granules. Just the stuff that comes in a big bag for killing grubs in lawns. Try to fill the holes(s) and a foot or so all around each hole. This is really not a lot of pesticide as it is very localized.

Wet the granules down. This activates them.


Check every couple of days and keep checking for new holes within a foot or so of the original nest. Retreat as needed. Usually one or two treatments is a permanent solution.