Irene from Yonkers Ny writes,
What can I use to rid ground hornets in my yard
You can use Drione dust directly applied to the nests with a hand duster for ground hornet control. We recommend that you either treat very late in the evening or very early in the morning to minimize the risk of attack. You should note that Drione dust takes a few days to kill the hornets and will not immediately knockdown the insects.
Answer last updated on: 08/01/2012