毛竹枯梢病的发生发展规律研究

通过人工接种和野外定点试验，竹喙球菌（Ceratosphaeria phyllostachydis)在福建能以菌丝、子囊孢子及分生孢子三种形态越冬。1-3级感病侧枝上形成的有性子实体是主要的初侵染原，子囊孢子萌发后从伤口或自然孔口侵入当年新竹，它主要靠雨水溅散作用传播。在整个生长季节都能释放子囊孢子，以5-7月份释放量最多。温度、降雨量和降雨日是影响病害发生发展的主要因素。6月下旬出现症状，8月上旬至9月上旬为发病盛期，10月下旬以后基体停止信展，病菌进入越冬，毛竹枯梢病是一种具有多侵染点的病害。

A STUDY ON OCCURRENCE AND DEVELOPMENT OF THE DIEBACK BLIGHT OF PHYLLOSTACHYS HETEROCYCLA

From field investigations and inoculations Ceratosphaeria phyllostachydis, the pathogen of the dieback blight of Phyllostachys heterocycla was found to overwinter as mycelium ascospores and conidi-um on the diseased organisims, The perithecia on the lateral branch of 1-3 class was the primary sources of infection and set off ascospores throughout the growing season of P. hetprocycla. especially from May to July. After germination , the ascospores spread over the branches and step in from wound or natural small openings. Temperature, rainfall and rainy days were main factors to the infection of the disease which appeared in late June, The heavest infection took place between early August and September and stopped its spreading after October. The pathogen overwintered from October to next April. The dieback blight of P. heterocycla was a species of disease for many infected courses. The development was mainly affected by the environmental factors: site quality, management class and growing power.