The Py Powder should be dusted on to affected plants, covering both sides of the foliage.Repeat treatments may be required for persistent pests.Py Insect Killer is all you need for rapid control of vast array of plant and garden pests including greenfly, blackfly, whitefly, thrips, caterpillars, flea beetles, capsid bugs, weevils, leafhoppers, and sawfly.It is suitable for all kinds or ornamentals and edible plants and crops can be safely picked the day after treatment.PY products can also be used to control many household pests including ants and wasps.