I was hiking with a friend in northern europe. It was +25C and we were being harassed by mosquitoes, horseflies and who knows what else. Naturally the same idea occurred to us - to use a head mounted laser to fry the wings of anything that approaches us. We were joking about the bulkiness - that you would have a power hungry i7 on your head, doing live object detection, a heavy power supply for computation and a strong laser, servo motors whirring directing the laser. It sounds unjust - the forest being their home and couple of city-dwellers killing the creatures for a bit of convenience.