If you have a roach infestation, mix equal parts of boric acid powder and flour, cornmeal or sugar. Put in small lids in the affected areas (keep away from pets and children). Roaches will walk through and eat the mixture when they clean their feelers and legs and then die.
Source: My son once moved into this Roach infested apartment, (one of his first), his neighbor told me how to get rid of them.
By Irishwitch from Aurora, CO
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Not sure why you would want to mix the boric acid in a flour/cornmeal/sugar mixture, would make it less likely to stick to them. Boric acid powder alone is what sticks to the tiny hairs on insects, then in turn as the groom themselves they ingest the toxin It needs to be applied in a very thin coating, like the amount of dust that accumulates in the home if you don't dust fro a few weeks.
Lar-exterminator
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