地涌金莲一种新病害病原菌特性研究

Characterization of the Pathogen Causing Golden Lotus Banana New Disease

地涌金莲[Ensete lasiocarpum（Franch.）Cheesman]叶斑病是一种在该植物上首次报道的病害.为了研究地涌金莲叶斑病病原菌[Alternaria alternata（Fr.）Keissler]的特性,对不同条件下的病原菌菌丝生长进行了观测.结果表明：该病菌在玉米粉培养基上菌丝生长良好,碳源和氮源分别以葡萄糖和硝酸铵为宜,在pH为6.0～9.0的范围内生长良好,菌丝致死温度为50℃.在供试的3种药剂平板试验中,咪鲜胺对病原菌的抑制作用效果最好,在推荐的使用浓度下相对抑菌率为94.6％.

Leaf spot disease of Golden lotus banana [Ensete lasiocarpum （Franch.） Cheesman] is the first report disease occurred on this plant.In order to describe the characteristics of the pathogen [Alternaria alternata （Fr.） Keissler],the mycelial growth in different conditions were observed.The results indicated that the pathogen mycelia were grown well on corn meal medium,optimal carbon and nitrogen source were dextrose and NH4NO3 respectively,suitable pH range was 6.0 ～9.0,and the lethal temperature was 50℃.The most effective fungicide was prochloraz among the 3 tested pesticides,and the relative inhibition rate was 94.6% under the recommended concentration.