yup. this is the stuff. you gotta get it into the tents tho.

On Mon, 11 Jun 2007 22:05:46 -0500, Treedweller
spray with Bt (Bacillus thurengiensis), available in most any garden
center. When the worms eat it with the leaves, the bacteria kills
them. It is safe for people, but it affects all worms/caterpillars,
so be careful not to spray it where you don't need it.