有效霉素A產品是Validamycin A is an antifungal agent used to protect rice plants against sheath blight caused by the pathogenic fungus,?R. solani, due to its ability to inhibit trehalase, a trehalose-hydrolizing enzyme (Ki?= 1.9 nM; IC50?= 0.7 μM).?It is also effective against the growth and sporulation of?R. cerealis,?F. culmorum, and other fungi. Validamycin A also demonstrates antiviral activity against fungal plant pathogens, including?Pellicularia sasakii?and?Rhizoctonia solani, but does not appear to be fungicidal in these cases.