腐烂病,主要危害树的主干和主枝,症状分为两种:一是溃疡型,主要发生在主干、主枝上,病部树皮呈红褐色,水渍状,微隆起,圆形至长圆形病斑。二是枝枯型,主要发生在2～5年生枝条上,病斑边缘清晰,不隆起不呈水渍状,染病枝条迅速失水干枯,后期病斑表面产生很多小黑点。一、做好早春清园冬前没有进行清 Rotten disease, the main damage to the trunk and the main branch of the tree, the symptoms are divided into two types: one is ulcer type, mainly occurs in the trunk, the main branch, diseased bark was reddish brown, water-like, slightly uplift, round to Oval lesions. Second, twig type, occurs mainly in 2 to 5 years old branches, lesion edge is clear, not uplift was not water-like, infected branches rapidly dehydrated dry, the lesion surface after the emergence of many small black spots. First, do a good job in early spring Qingyuan before the winter did not carry out