Master Nursery Pest Fighter Spray Oil offers effective insect control on fruit trees, vegetables, houseplants, and ornamentals without the use of synthetic toxins. This ultra-highly refined horticultural spray oil can be used all in dormant or growing seasons in temperatures from 40 degrees to 100 degrees without fear of burning or damaging your plants. Also protects against powdery mildew and prevents certain plant diseases. The oil spray blocks an insect’s air holes (spiracles), causing it to die from asphyxiation. OMRI approved for organic gardening, these oils kill a wide variety of insect pests such as aphids, scale, adelgids, whiteflies, spider mites, mealybugs, thrips, and more.