On Fri, 22 Jun 2018 16:14:31 -0700, T wrote:

The main draw of boric acid is that it is not toxic.
It dehydrates the buggers (roaches included) and doesn't
poison them, so they can not get tolerant of it.

Food grade diatomaceous earth (DE) has microscopic sharp edges. It
scratches the exoskeleton of ants, roaches and likely crickets.
Applied with a billow type powder duster.

Do not use pool DE as it has been heated, which takes the sharp edges
off.

Boric acid burns the, DE causes dehydration.