There are several great herbs that repel the bugs. I am working on several recipes this year mainly to repel fleas since our winter was so mild this year. Herbs great for repeling the flying insects citronella, wintergreen, peppermint, cedarwood, and eucalyptus. I mix in a spritz bottle a lightly spritz when outside, mainly on my clothes. If you have a hornet nest, or any type insect you can see, a mix with pyrethrin will kill them almost instantly. Pyrethrin is from chrysanthemum flowers and is harmless to all birds, mammals, and reptiles. Pyrethrin is great for killing, but I have had little luck with any repellant qualities. My best suggestion is to try different mixes until you find one that you find pleasant to smell and also keeps the buggies away. I have listed a few great herbs there is a multitude as some others on here have mentioned.