When applied directly, the insect suffocates. The citrus fragrance of d-Limonene acts as a repellent. Orange Guard is a water-based insecticide. Our tests showed no extensive or permanent damage. It is our opinion that as long as plants are not sprayed repeatedly, there should be no problem.
Exposure shortens the life of the repellency.
Orange Guard repels best in cracks and crevices and works when the surface is absorbent and saturated. Try to find source of infestation and re-apply Orange Guard. Shelf life has been independently tested at a university research lab by one of our licensees. The product was stress tested and proved to be effective for at least four years, at which time the tests were discontinued. We have not experienced any precipitation of the product during its shelf life.