"Kenneth D. Schillinger" wrote in message
...
Here I am in the middle of a Tent Caterpillar infestation and am
feeling
frugal.
My question is rather BT (Bacillum Thurengus SP?) will hold over a
year or
so. I guess I will find out because I sprayed the critters with the
old
spray, but if enough of you reply that BT goes dead in a year I will
go out
and buy fresh BT spray.
Thanks, Ken.

I blast the nests with a propane torch,


Ray