AI: 80.0% Fosetyl Aluminum. Aliette WDG brandfungicide is a systemic fungicide that may be applied to a wide range of ornamental flowering and foliage plants as a foliar spray, drench, or as a dip for control of diseases caused by pythium, phytophthora, and downy mildew. Aliette WDG can also be used for suppression of bacterial blight caused by certain pathovars of Xanthomonas campestris.