 , August 4, 2008 By Jonathan from CA from We used Gentrol IGR aerosol to attack a really horrendous roach problem in our house. Nothing else had had the slightest effect on this infestation, including two different visits by professional exterminators. Gentrol really worked, though it took several weeks to collapse the population. The present order of concentrate is to take care of a few stragglers, and keep our protection up.
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