Have you tried Over n' Out with fipronil? Use it sparingly all over the yard. It works slowly so that it is passed thru out the colony.
No, but it's now on my list. I've gotta get a new bulb for the zapper -- really has made a difference & cut back on some of the chewin' worms & caterpillars having that zapper decimate the moth population in our yard! Thanks for the suggestion! The ones in our yard think Orthene is free candy for all the good it does!