8种杀菌剂对尖孢镰刀菌的抑菌能力和田间防治效果

Bacteriostatic Ability and Field Control Effect of Eight Fungicides Against Fusarium oxysporum

为筛选出对马尾松立枯病防效较好的杀菌剂,以1年生马尾松幼苗为研究对象,采用杀菌剂与病原菌平皿对峙和田间防效测定的方法开展8种杀菌剂(普力克、代森锌、多菌灵、代森锰锌、甲霜恶霉灵、百菌清、甲基托布津、敌克松)对其病原菌——尖孢镰刀菌抑菌能力和苗期病害田间防效的测定,以选择较好的杀菌剂种类进而实现对马尾松立枯病的有效防控。结果显示:参试的8种杀菌剂中甲霜恶霉灵和百菌清对尖孢镰刀菌的抑菌效果更明显,甲基托布津、代森锰锌、代森锌、普力克、多菌灵、敌克松对尖孢镰刀菌的抑菌率相对较低;化学药剂浓度筛选结果表明,10 mg/mL的甲霜恶霉灵对病原菌的抑菌率达到77.3%;8 mg/mL的百菌清对病原菌的抑菌率达到100%;田间防效结果表明,10 mg/mL甲霜恶霉灵对马尾松立枯病的防治效果更好,其病害发病率为20.0%,防效达70.0%。

In order to screen out the fungicides with better control effect on dampingoff disease in Pinus massoniana,the 1-year-old P.massoniana seedlings were taken as the research object,determination of the bacteriostatic ability and field control effect of eight kinds of fungicides(prequel,desenzin,carbendazim,mancozeb,metalaxyl,chlorothalonil,thiophanate-methyl,dixon)on the pathogen——Fusarium oxysporum by the method of confrontation between fungicides and pathogens and field control effect determination,effective control on dampingoff disease in P.massoniana by selecting better fungicides.The results showed that the antibacterial effects of metalaxyl and chlorothalonil on pathogenic bacteria were more obvious among the 8 fungicides tested,thiophanate-methyl,mancozeb,desenzin,prequel,carbendazim,dixon,the antibacterial rate of dixon against pathogenic bacteria was relatively low;the screening results of chemical concentration showed that the antibacterial rate of 10 mg/mL metalaxyl to pathogenic bacteria reached 77.3%;the antibacterial rate of 8 mg/mL chlorothalonil reached 100%;the field control results showed that 10 mg/mL metalaxyl had better control effect on masson pine blight,the disease incidence rate was 20.0%,and the control effect was 70.0%.