On Sun, 11 Jul 2010 14:15:11 -0500, The Daring Dufas
wrote:

That's why diatomaceous earth kills them. When they run their legs
over their shell, the diatomaceous earth scrapes the wax off which
hold moisture in their bodies, the roach will soon dehydrate and die.

You Betcha! The DE _needs_ to be food grade (farm supply).

DE for pools is heated and that takes the fossil edges off.