This spray will deter insects and can also be used on Powdery Mildew. Simply grind 2 whole garlic bulbs, not 2 little cloves and add to 2 cups of boiling water. Let it steep overnight. Strain through cheese cloth into 3.5 liters of water and add 1T liquid dishwasher. This can be stored in the fridge for a whole summer. It's referable to spray in the morning and the late afternoon.