香梨腐烂病发病原因是遭受到强冻害,伤口保护不及时,树势衰弱。香梨产区历年都有中、轻度香梨腐烂病的发生。1发病症状一般发生于主干基部或二年生枝条。症状表现为渗水、发黑、变烂、有腥味。2致病因素主干基部主要是由于香梨优斑螟蛀入,其次为冻害;二年生的枝条致病因素为伤? Pear rot disease is the cause of the disease suffered a strong freeze, wound protection is not timely, tree weakness. Pear production areas over the years have been, the occurrence of mild pear rot disease. 1 symptoms usually occur in the trunk base or biennial branches. Symptoms manifested as water seepage, black, worse, smell. 2 pathogenic factors stem base is mainly due to fragrant pear spotted borer into, followed by frost damage; biennial branches of the pathogenic factors for injury?