Electric bug zappers (Toad feeders) won't fill the bill. They are good at killing harmless moths.
You are going to think I'm crazy until you try it. Invite a yellow jacket to dinner. Be nice, talk nice & share. They don't eat much and if you don't threaten them they can be moved from your bite of choice with a gentle movement of your fork. Remember that the yellow jacket is your friend. They read fear as aggression. Welcome one or two and they will not hurt you.
You see, a yellow jacket is carnivorous and all the other bugs know the are mean SOBs. Thus they stay at least 4' away. No flies, no mosquitoes and I don't have to share my beer unless it is with a yellow jacket - who I can gently move to my plate. I'm not sure why, but butterflies get along with them also and will eat side by side. I share with both.
Not all insects are bad. If you have a problem with them after using a repellant, don't whine - stay inside.
Hilditch