梨黑星病又叫疮痂病,为害叶、果实、新梢等,导致早期大量落叶,幼果畸形,影响第二年产量。 1.为害症状:果实初发病呈现淡黄色圆形斑点,逐渐病部凹陷,上长出黑霉,病斑木栓化,坚硬、凹陷龟裂。叶片发病时,叶背沿叶脉呈现圆形、椭圆形或不整形的淡黄色斑,无明显边缘,上长出黑色霉,严重时,叶背布满黑色霉层。 Pear scab is also known as scab disease, damage to the leaves, fruits, shoots, etc., leading to a large number of early leaves, young fruit deformities affect the second year of production. 1. Harmful symptoms: the first incidence of fruit showing a pale yellow round spots, and gradually diseased parts of the disease, the growth of black mold, lesion liaison, hard, concave crack. Leaf blade disease, leaf dorsal along the veins showed a round, oval or irregular yellowish spot, no obvious edge, grow black mold, severe, black moldy leaves covered.