The second, much more safe route is Dionasheous earth (I am sure
that this is spelled incorretly). There are two types, the first
is salt water and the second is fresh water. You want the fresh
water. This is the organic farmer's best friend. It is nothing
more than the crystalline remains of water going critters. It works
like this... you spread this stuff around and the ants walk over it
and slices up their armor, causing them to die a slower death through
dehydration. You may be skeptical, but I have used this stuff for
army ants and roaches in various greenhouses in Maryland and New York
and the proprieters (friends of mine who trusted that I wasn't crazy)
were quite pleased witht the results
Chris