Monterey Neem Oil RTU is a ready-to-use organic insecticide and fungicide perfect for organic gardening. Neem oil has long been known for it’s insecticidal properties and this also helps to control diseases like blackspot, powdery mildew, and rust, and controls pests like spider mites, aphids, whiteflies, and more. Monterey Neem Oil RTU can be used indoors and outdoors on roses, flowers, houseplants, ornamental plants, shrubs, fruit and nut trees, and vegetables.