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一、病征发病部位为叶、果实和新梢。叶子发病初期为黄白色多角形的碎白点花纹状斑点,之后,在斑点处形成大量的黑色煤烟子状的分生胞子,人们把这叫做春型病斑,从春季到夏季都能看到。从8月下旬,叶内形成模糊的薄墨状的病斑,这叫做秋型病斑。幼果发病在4月末左右,发病初期果面的一部分变黄,在部分果面上出现煤烟子状的分生孢子。果柄上的病斑有的造成早期落果。即使成熟果也会形成疮痂状的病斑,在果面出现龟裂。新梢上的病斑为黑色圓型病斑。
First, the disease pathogenesis of leaves, fruits and shoots. The early onset of leaves is yellow-white polygonal white spots pattern-like spots, then, in the spots formed a large number of black sooty zygote, people call spring-type lesions, from spring to summer can see To From the late August, the formation of a blurry thin ink-like lesions within the leaves, called autumn-type lesions. The incidence of young fruit around the end of April, the early part of the incidence of yellowing of the fruit surface, in some fruit surface appear sooty conidia. Some lesions on the stalk caused early drop fruit. Even mature fruit will form a scab-like lesion, cracking in the fruit surface. The shoot on the black lesions of the circular lesions.