Monday, September 15, 2008
Neem oil is an approved pesticide in California for use on ornamental and food plants. It is derived from the neem tree. Aphids, caterpillars, loopers, mealy bugs, thrips, whiteflies, and diseases like mildew and rust are effectively controlled. It is most effective when alternated with insecticidal soap or pyrethrum, killing problem insects in different stages of development. Follow label instructions. Spray 2 or 3 times from 7 to 10 days apart. As with all horticultural oils, do not spray if daytime temperatures will exceed 90F.