杨树球二孢溃疡病的研究—生物学特性、发病规律及药剂筛选

Study on poplar canker caused by Botryodiplodia populea Z.K.Zhong: biological characteristics of pathogen, pattern of disease incidence and fungicide selection.

经试验,杨树球二孢溃疡病菌(Botryodiplodia populea Z.K.Zhong)适宜生长温度为20—25℃,pH6—7,在PDA和麦芽粉培养基生长良好。该病于4月中下旬产生病斑,5月上旬呈现颗粒状的子实体,5月中旬以后逐渐成熟开裂,溢出炭黑色的分生孢子,病原菌以菌丝体在树皮内越冬。经室内药剂筛选,660B生物农药抑菌效果最佳,可达95％。

Experimental results show that the suitable growth temperature of Botryodiplodia populea Z.K.Zhong is 20—25℃, the suitable pH is 6—7, and potato dextrost agar and malt agai media are suitable for its growth. The bark produces disease spot during the second and last ten days of April, and the conididia appear in the first ten days of May. The conididia gradually mature, split and spill over the conididia after the second ten days of May. The fungus overwinters in the bark with mycelium. Through the fungicide selection in the laboratory, the biological fungicide 660B shows the best result for controlling the pathogen.