延边烟草猝倒病病原菌鉴定及药剂防治

Pathogen Identification and Medicament Control of Tobacco Damping-off in Yanbian

为明确延边地区烟草猝倒病病原菌种类并开展科学的药剂防控,依据培养性状及形态特征对病原菌进行鉴定,采用菌丝生长速率法测定15种杀菌剂对病原菌的毒力,并开展25%嘧菌酯SC防效试验。结果表明,引起延边烟草猝倒病的病原菌为瓜果腐霉菌(Pythium aphanidermatum);25%嘧菌酯SC毒力最高,EC_(50)≤0.01 mg·L^(-1),其1000倍液平均防效达84.00%,与对照药剂处理差异显著。因此,25%嘧菌酯SC可以作为烟草猝倒病的防治药剂或轮换药剂。

In order to clarified the species of pathogens causing tobacco damping-off in Yanbian and carried out scientific pesticide prevention and control,identification of pathogens by cultivation properties and morphological characteristics identification was carried,and toxicity of 15 fungicides to pathogen were determined by mycelium growth rate method,with controlled effect experiment of 25%azoxystrobin SC.The results showed that pathogen causing tobacco damping-off disease in Yanbian was Pythium aphanidermatum,25%azoxystrobin SC had the highest toxicity,EC_(50)≤0.01 mg·L^(-1),the average control effect of its 1000-fold solution reached 84.00%,which was significantly different from that of the control treatment.Therefore,25%azoxystrobin SC can be used as a control agent or a rotation agent for tobacco damping-off.