白术根腐病菌分离及致病性研究

Isolation and Pathogenicity of the Pathogens Causing Root Rot Disease of Atractylodes macrocephala Koidz

在同一地块通过对白术根腐病的发病情况进行调查,确定白术根腐病分为湿腐和干腐2种症状,湿腐为主要症状类型,在田间所占比例达69.68%.通过对30个病株样本进行病原分离,共分离得到131个菌株,12种分离菌中有7种对白术具有致病力,其中尖孢镰刀菌(Fusarium oxysporum)和茄病镰刀菌(F.solani)能产生白术根腐病的典型症状.尖孢镰刀菌为根腐病主要致病菌,并能导致两种症状,致病率达90%;茄病镰刀菌危害症状为湿腐,致病率为30%.

Investigation in one Atractylodes macrocephala plot showed that root rot of the plants had two different types of symptoms：dry rot and wet rot,and wet rot was the main symptom,accounting for 69.68% of the total.Altogether,131 fungus strains were isolated from 30 diseased plant samples.They belonged to 12 fungus species,of which 7 was pathogenic to A.macrocephala.Infection by Fusarium oxysporum and F.solani would produce typical symptoms of root rot.The main pathogen was F.oxysporum,which could cause both dry rot and wet rot,with a morbidity of 90%.F.solani had a morbidity of 30%,and its symptom was wet rot.