Hoja blanca of Prunus americana incidence in total is 20%-35%,among which the disease incidence of leaves is 10%-25% with disease index 10-25 in Hunan Province.

• 布朗李叶枯病在湖南布朗李树上一般株发病率为20%25~35%25,叶发病率10%25~25%25,病情指数10~25;