It contains deodorized sulfur (.40%) a natural element which kills fungus. Defender Garden Fungicide can be used on fruits, flowers, vegetables, flowering plants and ornamentals. A liquid, sulphur-based fungicide which controls the most common surface-infecting fungal problems such as powdery mildew, black spot and rust. Defender actually defends the plants by covering them with a protective coating. This product is ideal for roses as it does not have the strong smell often associated with sulphur-based products.