摘 要 ：经Koch‘s法则检验证明,Alternaria tenuis Nees (细链格孢霉)是北京地区古柏赤枯病的病原菌。它引起古柏针叶及嫩梢的大量死亡。2—3年生桧柏及侧柏苗经人工接种证明,该病菌有较强的致病力,它还侵染某些种类的杨树。该病潜育期为5—6天。对病菌生物学特性也作了研究。病原菌生长和孢子萌发最适温度为25℃F相对湿度在90%以上;最适pH值为6;葡萄糖、淀粉、蛋白胨、谷氨酸为该菌纯培养的优良营养源。
Abstract:The pathogen has been examined by Koch‘s postulates as Alternaria tenuis Nees of red blight of old juniper.It caused a lot of blight needles and tender shoots to die down after artificial inoculation to the seedlings of 2-3 years Sabina chinests and Platycladus orienta,it was proved that pathogen has very high pathogenicity to the host plants,it also infects some varietis of poplar.Incubation period of the disease is 5-6 days.Some researches on the biological characteritics of the pathogen was also done.The optimum temperature and relative humidity for spores geminetion and hyphae growth are about 25℃ and 90%.The optimum pH value for hyphae growth is 6.Glucose,starch,tryptone.Glutamic acid are good C and N sources in axenic culture of the pathogen.