RoseClear Ultra kills greenfly, blackfly and other aphids, even those that are hiding away under leaves. It controls existing infections of the key diseases on roses and other ornamental namely rose black spot, powdery mildew and rust. It also protects plants from further infestations of aphids and diseases with a recommended spraying interval of 3 - 4 weeks between applications. A single spray should be applied as soon as you see the first few greenfly or black fly. This will kill them within 24 hours. Rose Clear Ultra provides the new industry standard and is a vast improvement on the original Rose Clear, where re-application was needed every two weeks to give disease protection. Each treatment with new Rose Clear Ultra now lasts twice as long