With modern electronics, wouldn't it be possible to build a device that detects bugs using some type scanner (radar or whatever) and zaps them with a microwave laser? That seems like it could be 100x more efficient than this solution.
https://www.indiegogo.com/projects/worlds-first-portable-mos...
The energy needed to kill a mosquito shouldn't be more than a joule or so, and regarding blinding, I suggested the microwave spectrum specifically to avoid that problem.
There was an interesting idea the other day for a mini drone that bashes them with its prop - top comment here https://news.ycombinator.com/item?id=44702833