The next choice in an IPM regimen may be Bt, a selective microbial insecticide that does not harm natural enemies. Alas, at this time, there are Bt formulations available only for caterpillars, some immature flies, and certain beetles. Your first option would be to try an oil or a combination soap and oil spray. Then, as a last resort, you might consider stepping up to a pyrethrum-based insecticide. The source of pyrethrum is the flowers of Chrysanthemum cinerariaefolium, also called the Dalmation flower.
Pyrethrum is derived from the flower of Chrysanthemum cinerariaefolium .
You might think that because it is derived from a natural source, a pyrethrum-based product is automatically safe. If you follow the directions for use on the package, it is relatively safe for people and pets, but it is unquestionably a true poison and will kill all insects it comes in contact with, both pests and beneficial insects alike. The most commonly available pyrethrum-based insecticides contain extracts from the flowers called pyrethrins. Because pyrethrins degrade rapidly in sunlight, they usually disappear from the garden within 24 hours, allowing you to pick your produce not long after spraying. You're not alone if you find the names of these insecticides perplexing.