我省许多苹果树常得一种缩果病,有此病的果树新梢顶部嫩叶的叶脉两侧出现皱纹,并有不同程度的退绿现象,叶片狭长,向反面卷曲,严重时干枯死亡。果实症状有两种类型:一是干斑型,即在落花至初果期发病,起初果面上出现圆形水浸状坏死,进而变为褐色病斑,干缩凹陷,有的病斑干裂,果实小而畸型。二是果肉木栓型,多在生育后期发病,果形虽属正常,但果肉坏死变成褐色,呈海绵状,无食用价值。 Many apple trees in our province often have a reduced fruit shrinkage. The foliage of the top leaves of fresh fruit shoots of this disease appears wrinkles on both sides of the veins, with varying degrees of back-greening phenomenon. The leaves are long and narrow, curling to the back, and dead in severe cases . There are two types of fruit symptoms: one is the dry spot type, that is, the disease begins from the stage of flowering to early fruiting. At first, it appears circular immersion-like necrosis on the surface of the fruit, which turns into brown spot, dry shrinkage depression and some dry spots Small and abnormal fruit. Second, flesh cork type, mostly in the late stages of disease onset, although the fruit shape is normal, but the flesh necrosis turned brown, sponge-like, non-food value.