Contains a special combination of ingredients that help reduce possums browsing on plants. Lasts for up to 7 days or more with regular re-treatment. Can be used on ornamental and edible plants and has only a 1 day withholding period. The formulation was developed by Professor Lynne Selwood and is protected by a patent granted to the University of Melbourne. Yates Possum Repellent Spray helps protect your precious plants by deterring possums from browsing on sprayed plants.