The invention describes a synergistic effect when garlic oil or extract is combined with essential oils which results in an improved insecticide/fungicide which is natural and contains no chemical additives. Essential oils are defined in this application to be volatile liquids obtained from plants and seeds including cotton seed oil, soybean oil, cinnamon oil, corn oil, cedar oil, castor oil, clove oil, geranium oil, lemongrass oil, linseed oil, mint oil, sesame oil, thyme oil, rosemary oil, ani...