毛叶枣黑斑病的病原鉴定及其生物学特性研究*

毛叶枣黑斑病菌是半知菌类链格孢属链格孢Alternaria alternaria。病菌生长和产孢温度范围10～35℃，适宜温度25～30℃；PDA培养基最适宜病菌生长和产孢；病菌在pH3～11时均能生长和产孢，pH6～7最适生长，pH5最适产孢；孢子萌发率在20～30℃和pH5～9时较高，25℃和pH为7时萌发最好；在饱和湿度再加水滴的条件下孢子才能很好萌发；1%葡萄糖液和毛叶枣汁液对孢子萌发有促进作用。

Studies on the Identification and Biological Properties of the Pathogen of Indian Jujube Black Spot

It was identified that Alternaria alternata Keissler. was the pathogen of Indian Jujube black spot. The temperature range for the pathogen growth and sporulation was 10~35℃ with the optimal of 25~30℃. PDA was the optimal medium for the mycelial growth and sporulation. The pathogen could grow and sporulate in the condition of pH 3~11,while the optimal pH for mycelial growth was 6-7 and for sporulation was 5. The conidium could germinate well at 20~30℃ and pH 5~9, with the optimum of 25℃ and pH 7, the optimum humidity was RH 100% with water drop. 1% liquid of dextrose and leaf extract of Indian Jujube could hasten spore germination obviously.