云南当归软腐病的危害性及病原鉴定

Studies on the dangers of soft rot of Angelica sinensis roots in Yunnan and identification of the pathogens

云归受软腐病危害严重,为了解生产受损情况并明确其病原,调查了田间受害情况并对病原进行鉴定.田间调查发病株率,采集病害标本,观察植株病害症状,实验室分离、镜检鉴定病原.该病造成当归根部软腐,调查田块发病面积100%,发病株率20%左右,造成至少10%的产量损失或近20%的经济损失.病原为线虫,其形态与腐烂茎线虫的重要鉴别特征相符,且形态测量数据在原定种的范围内.结果显示云南当归软腐病由腐烂茎线虫(Ditylenchus destructor)引起.

In order to investigate the damages and pathogens of soft rot of the Angelica sinensis roots in Yunnan,the diseased plants of the fields were investigated,the pathogens were separated and identified after collecting the infected plants specimens,observing symptoms of soft rot.The incidence rate of soft rot was 100% in all the fields investigated,the infected rate of the plants was about 20%,which caused 10% output losses and nearly 20% economic losses.The identification showed that the pathogens leading to this soft rot in Angelica sinensis was Ditylenchus destructor.