Sierra Natural Science Fungicide Concentrate - 1 Pint Kills fungus and mildew and is highly effective for the control of a broad spectrum of vegetable, fruit and ornamental plant fungal diseases How it works: As a topical spray SNS 244 Natural Fungicide kills the fungus through a biochemical interaction on the spores Some of the components of SNS 244 Natural Fungicide are also absorbed systemically by the plant, suppressing the life cycle of the fungal spores and nurturing the plant cells to increase the plant's ability to fight the disease