Fungus Clear Ultra helps treat fungal diseases that feed on living plants, in doing so they stunt the plants growth. If left untreated plant growth and flowering may be severely affected. Controls blackspot, powdery mildew and rust on roses, other flowering and ornamental plants, trees, shrubs and conifers. Use from April onwards or from the start of the first disease. Spray at the first sign of disease attack and repeat at 21 day intervals.