This is an effective bug repellent, based on Julliette de Bairacli Levy's recipe in her book Traveler's Joy. It's dual action is provided by first extracting the bitter herbs into a carrier oil base and then adding strong-acting essential oils. Also an excellent after-bite remedy, tones and softens skin too.

Coarsely grind herbs. Proceed to make an herbal-infused oil with the herbs and olive oil following using your favorite extraction method. Pour strained herbal-infused oil into a jar, add the essential oils, cap and shake. It is ready for use. You may not have access to all of these herbs, unless you are growing them, if so you can make a simpler oil with just the wormwood. The effectiveness of the oil depends in large part on the bitterness of the wormwood, good quality wormwood should taste disgustingly bitter and have strong aroma.

Green Bug Juice With Fresh Herbs
If you are growing these herbs, stuff a jar half full with wormwood and then filling the rest of the jar with equal parts of rue, sage, tansy, pennyroyal, and southerwood and make your herbal oil infusion. For every 2 ounces of strained oil you get, add 50 drops eucalyptus, 13 drops lemongrass and 10 drops of spearmint.