Pyrethrum is a botanical derived insecticide made from some types of
flowers. It is potent, although not as toxic as some other pesticides.
I would think it would kill most insects, period. Be very surprised
if it would really do much damage to your property ecosystem since it
would be set up on the perameter. If you do decide to install one, let
us know how it works.
If the system sprayed sevin or some systemic insecticide poison, I
would be more concerned.