Fungus Fighter is a general purpose, ready to use systemic fungicide for use on roses and other ornamental plants. Excellent control against black spot, mildew and rust on roses, and mildew and rust on ornamentals. Use at the first signs of disease and repeat at fortnightly intervals throughout the flowering season. Most effective when used between March and October. Contains Myclobutanil. Always read the label on your purchased product before use.