Have you thought about diatomaceous earth? It's in a nutshell, microscopic extremely razor sharp particles and slices the exoskeleton of the insects, causing them to sorta "bleed out" and die.
It works on insects as they walk over the earth. Here is a quick link I found on it, I didn't read over the link but it looked good from the description. Or you can look at the wikipedia for it.
Originally Posted by littleindiangirl
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