Fluazinam is a broad spectrum contact fungicide that can be applied as a foliar spray or soil treatment. It is effective against a number of pathogenic fungi that cause the following diseases: gray mold and downy mildew in grapes; melanose and mites in citrus; scab and Alternaria blotch in apples; clubroot in crucifers; Sclerotinia blight in peanuts; white root rot and violet root rot on fruit trees. Its best known however due to the fact that it protects against Foliar blight , tuber blight and sclerotinia rot in potatoes caused by the fungus Phytophthora infestans. The effect on potatoes is unparalleled. Fluazinam is effective against both spore germination and spore growth, thereby giving it protective action with a good residual effect. It also has good rainfastness. The mode of action of fluazinam is due to the disruption of energy production in the fungus at multiple sites - therefore preventing resistance.