Growing Success Rose Guard offers a pesticide-free alternative for bug and disease control for roses and ornamental plants. It works by physical action to provide safe and effective control of a wide range of pests such as greenfly, blackfly, powdery mildew, and spider mites. Made with natural ingredients, the formulation is bee and ladybird friendly, and pests will not develop resistance to the product. Treated plants will also build a protection barrier to prevent further attack.