I like this recipe because it allows me to tailor the oils to meet the needs of my current situation. Try using this base recipe and then add in your booster oils of choice based on your geographical and environmental needs.
Base Insect Repellant Recipe
10 drops of insect blend essential oil (find out details here)
10 drops of cleansing essential oils blend (find out details here)
10 drops of the booster oils of your choice (see below)
Add the combined 30 drops of essential oil to a small glass spray bottle. Top with water and shake. Shake before each use.
Booster Oil Ideas:
Ticks: Melaleuca, Geranium,
Gnats: Eucalyptus, Lavender
Mosquitos: Patchouli, Lavender,
(Reference: Modern Essentials: A contemporary guide to the therapeutic use of essential oils, 6th ed, 2014, AromaTools. )