Replied By Pam E. (Southern California) on 05/05/2021
D.E. / Diatomite can kill any bug with an exoskeleton ... and, that includes ALL cockroaches. This video shows a cockroach in a jar with no escape from D.E., & it walking & moving in the D.E. It nicks & cuts its exoskeleton, allowing the dry & very absorbent D.E. to absorb its body moisture, until it dies.... If given a choice, the ants I treat with D.E. touch it once & turn away ... even from a plate of cat-food. (I put a mote of it in a dish under the food-bowl). Instructions for using D.E. include ... putting it where the insects come in from outside, to turn them away before they ever get inside! Https://www.youtube.com/watch?v=lAKQO7duPHU