Monterey Garden Phos Systemic Fungicide previously known as  Agri-Fos Systemic Fungicide is very effective in controlling plant diseases such as Pythophthora, downy mildew, pythium, black spot, root rot, anthracnose, and more. It contains mono- and di-potassium salts of phosphorous acid and it functions as both a curative and preventive treatment to plants. It may be applied as a foliar spray, soil drench, by soil incorporation, through basal bark treatment and as a bare root dip. It can be used in trees, turf, ornamentals, in landscapes and interiorscapes, and bedding plants.