Mosquito treatments are done with pyrethroids or with natural products called essential oils.
Pyrethroids are man-made formulations derived from pyrethrins, a pesticide found naturally in some chrysanthemum flowers. These synthetic formulations hold up better to U.V. degradation and rain, so they last longer. In recent years chemical companies have come up with amazing control release technology that is taking pyrethroids to the next level. Some formulations feature a polymer layer and other microencapsulation technology that locks the active ingredients in capsules of thinner and thicker walls. These long-lasting formulations protect the active ingredients from the elements making them more effective for mosquito control.
Essential oils consist of blends of various oils, such as clover, cottonseed, rosemary, peppermint, and geraniol. Natural insecticides kill pests on contact by plugging the spiracles (respiratory openings) of insects so they cannot exchange gases. Once the botanical oils dry up, they become repellents.