川芎炭疽病病原鉴定及4种杀菌剂对病原的抑制作用

[目的]对川芎炭疽病进行病原分离鉴定,并选用4种常用的杀菌剂进行抑菌试验,选择最佳抑菌药剂。[方法]按柯赫氏法则分离病原菌并进行形态鉴定;用平板菌丝生长抑制法进行杀菌剂抑菌试验。[结果]病害标本分离出的炭疽病菌与胶孢炭疽菌描述的形态特征相符;除灭菌成外,其余3种杀菌剂均可抑制该炭疽菌生长,处理7d后1000倍甲霜灵锰锌、代森锌、甲基托布津对该病菌的生长抑制率分别为26.8%、22.1%、59.8%。[结论]川芎炭疽病是由胶孢炭疽菌[Colletotrichum gloeosporioides（Penz.）Sacc.]侵染所致,川芎是胶孢炭疽菌的新记录寄主;该病菌的最佳抑制杀菌剂为甲基托布津。

Pathogen Identification of the Anthracnose of Ligusticum chuanxiong Hort. and the Inhibitory Effect of Four Fungicides on the Pathogen

[Objective]The research aimed to isolate and identify the pathogen of anthracnose of Ligusticum chuanxiong Hort.and make the antifungal test on four kinds of fungicides for selecting the optimum fungicides.[Method]The pathogenic fungi was separated according to Koch's rule and the shape characteristics were identified.The antifungal test of fungicides was made by using plate mycelium growth inhibition method.[Result]The pathogenic fungi was separated from leaves of Ligusticum chuanxiong Hort.and its morphological characters were consistent with that of Colletotrichum gloeosporioides.In addition to chloroisobromine cyanuric acid,the other three fungicides could inhibit the mycelium growth.The growth inhibition rates of 1 000 times Metalaxyl + mancozeb,zineb,thiophanate-methyl for the mycelium were after 7 days 26.8%,22.1%,59.8% respectively.[Conclusion]The anthracnose was caused by Colletotrichum gloeosporioides.Ligusticum chuanxiong Hort.was a new record host plant of Colletotrichum gloeosporioides and the best inhibiting fungicide was thiophanate-methyl.