6种杀菌剂对小麦叶斑根腐病菌的毒力测定

Toxicity Assay of Several Chemical Fungicides Against Pathogen of Wheat Root Rot

筛选高效的防治药剂并研究出其配套的田间防治应用技术是防治小麦根腐病的重要措施,而通过不同杀菌剂对病原菌的毒力测定分析,可为田间防治药剂的筛选提供重要的参考依据。此研究采用生物测定的方法,研究了6种化学药剂对小麦叶斑根腐病菌菌丝生长的抑制作用。结果表明,不同药剂对病原菌生长的影响不同,世高对菌丝生长的抑制作用最显著,在质量浓度为40mg/L时抑制率达94.9%;其次为唑醚·代森联、丙森锌、福美双、多菌灵和代森锰锌,在该浓度下对菌丝生长抑制率依次为89.5%、86.3%、48.2%、40%和37.8%。对病原菌菌丝生长抑制效果最好的世高对病原菌孢子萌发同样具有强烈的抑制作用,抑制萌发中浓度为6.45mg/L,可在生产中继续合理使用。

Screening and management of high performance chemical fungicide was the important way to control wheat disease caused by Bipolaris sorokiniana.Suitable fungicide used in the field could be sreened by virulence testing in laboratory.The inhibition of 6 kinds of fungicides on B.sorokiniana,the phynotype of wheat root rot,was studied using biometric methods in this study.The results showed that different fungicides on colony growth was different,in which Difenoconazole was the most effective one to the pathogen,94.9% inhibition rate was obtained when the concentration was 40 mg/L.Metiram,Propineb,Thiram,Carbendazim and Mancozeb were effective in turn,with the inhibition rate of 89.5%,86.3%,48.2%,40% and 37.8%,respectively.Strong inhibition of spore germination was also displayed with Difenoconazole,hemi-inhibitory concentration was 6.45 mg/L,showed that this agent can be used in production continuously.