There are some wasps that built their nests in the ground. I know I had it happen two years in a roll, and it was almost impossible to get rid of them. You might look to see if there is an indentation in the ground that buzzes. the best time to spray is during the night or before the sun rises. This is when they are less active.
@joansmor I found that when conditions are right, a little petrol accelerant and a match works, if in a isolated spot. BUT, conditions are dry, the fire department frowns upon that action.
I did that once with a gopher hole that had surfaced near my septic tank. Lite it and had a calm little flame, then a minor explosion, I had visions of water fountaining from the toilets in the house... That stopped that practice.
Ian
I did that once with a gopher hole that had surfaced near my septic tank. Lite it and had a calm little flame, then a minor explosion, I had visions of water fountaining from the toilets in the house... That stopped that practice.