posted 11 years ago
<puts on broken record>
If this is a ground nest, and you can get dry ice, you can kill it by putting dry ice on it and then weighing down a sheet of plastic on it. The carbon dioxide suffocates them. Naturally, you do this operation at night because the little buggers are not at their best, and are all at home.
</end of broken record>
That said, this is only useful in controlling one nest, and I have read (doubtless on some unreliable web page) that the overall density of the wasps will barely be effected because it's an ecosystem and tends to stay in balance. Other nests will begin foraging that territory, and with increased food will grow more wasps to maintain their ability to patrol it.
Gani
Intermountain (Cascades and Coast range) oak savannah, 550 - 600 ft elevation. USDA zone 7a. Arid summers, soggy winters