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How long dose it take to kill a roach afer they walk thoroug boric acid roach killer?

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asked Aug 19, 2012 in Pest Control by anonymous
   

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It can take a few days per roach, but many will die much quicker than that. It may be more than a week before you see a significant reduction in a big number of them -- but it does work.
The trick is to lay down a very fine layer of boric acid powder, because the roaches will walk around piles of it. Not because it's poisonous, but just like people will avoid a puddle or snow drift. (When I read that I thought it was a great description that made a lot of sense!)
answered Jan 17, 2014 by jjohnson Inquisitive Expert (54,120 points)

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