<p>A method and composition for the method for preventing insect infestation that comprises applying to the area to be protected an effective amount of solid material coated with by treatment with a composition comprising a silicone polymer, and an essential oil. A protective effect by reducing the population of harmful biological pests in the locality to be protected is provided. Protection by penetrating the material to be protected with the silicone polymer and optionally an essential oil is also disclosed.</p>