A method of controlling Fusarium disease on potato, wherein the method comprises contacting potato tuber with a composition comprising lower alkyl naphthalene. The growth of Fusarium is controlled by treating the potato tuber with a composition comprising lower alkyl naphthalene.一種控制在馬鈴薯上的鐮孢菌疾病的方法,其中該方法包含有令馬鈴薯塊莖與一含有低碳烷基萘的組成物接觸。鐮孢菌的生長藉由以一含有低碳烷基萘的組成物處理該馬鈴薯而被控制。