Ensure clean healthy plants with Fungus Fighter Plus Ready to Use, Fungus Fighter Plus is a systemic fungicide that gives long-lasting control for up to 3 weeks. Fungus Fight Plus is the ideal solution to control Blackspot, Powdery Mildrew and Rust on Roses and Leaf Spot including Box Blight, Powdery Mildrew and Rust including White Rust on woody and non woody ornamental garden plants and selected edibles.