Neem oil is an organic insecticide that interferes with insect hormone processes, affecting feeding habits, mobility and reproduction. It is known to be effective in controlling
- aphids, spider mites, scale, whiteflies, certain beetles and leafrollers
- anthracnose, black spot, rust, powdery mildew, scab and flower, botrytis, twig and tip blight, and turf diseases
Because neem oil works systemically through the plant and the insect, results do not appear immediately as they may with contact insecticides.
Here is a general fact sheet about neem oil from the National Pesticide Information Center. http://npic.orst.edu/factsheets/neemgen.html I hope you find this information helpful.