Lemon Eucalyptus (E. citriodora) Geranium (Pelargonium graveolens) Mosquito spray and lotions can be found in a different category. Use this concentrated essential oil blend to make your own mosquito repellent in a base lotion or spray and in an aromatherapy diffuser. Do not use on the skin undiluted. The Center for Disease Control (CDC) recommends a combination of geranium and lemon eucalyptus oil as an effective natural alternative to using DEET to repel mosquitos. This inspired me to create a natural formula using pure essential oils. Use this blend diluted as a repellent for mosquitos and other insects.