Right. I still think that getting the bugs to the kill-system is probably more effective than getting the kill-system to the bugs. Figuring out how to create bait-and-kill systems that are cheap, abundant, targeted, and effective is probably the best option.

Attractant, kill mechanism (detergent & water), and some way of getting the bugs onto / into / misted by this, is the general formula I'm looking at.

Spray-based pesticides is a move-the-mountain-to-Mohammed approach.