Potato blight can be referred to two types of blight diseases which are late blight caused by OomycetePhytophthora Infestans and early blightcaused by the fungusAlternariasolani.Of all the potato diseases, late blight is the most destructive disease and an important of potato disease that has been recognized in the late 19th century by which spread quickly, later caused the Great Potato Famine.