山楂锈病在辽宁省丹东地区的凤城、宽甸、岫岩和振安区等山楂产地均有不同程度的发生。山楂锈病为害山楂叶片、叶柄、果实、果柄及新梢。叶片被害,先于叶正面产生桔黄色小斑点,直径约2mm左右,后扩大到4—10mm。1个叶片有病斑数个,多者数10个。以后病斑上产生桔黄色小点(病菌的性孢子器)逐渐变黑。发病后30天左右(7月上旬左右),病斑背面凸起,产生灰黄至灰褐色毛状物 Hawthorn rust in Dandong, Liaoning Province, Fengcheng, Kuandian, Xiuyan and Zhen’an hawthorn origin have varying degrees of occurrence. Hawthorn Hawthorn damage Hawthorn leaves, petioles, fruits, fruit stalks and shoots. Leaves were killed before the orange leaves on the front of the small spots, diameter of about 2mm, after expanding to 4-10mm. A blade has a few spots, more than 10. After the lesion orange dots (germs spores) gradually black. About 30 days after onset (early July or so), the back of the lesion bulges, resulting in gray-to-brown hair