芦笋茎枯病菌对几种杀菌剂敏感性的测定

Test of Sensitivity of Phomopsis asparagi to Several Fungicides

测定了田间采集的一些芦笋茎枯病菌菌株对甲基托布津的敏感性，结果表明：芦笋茎枯病菌对甲基托布津已存在不同程度的抗药水平。在离体条件下用百可得、百菌清、福美双、敌力脱、烯唑醇、乙霉威对甲基托布津敏感、抗药菌株进行测定，结果显示：烯唑醇、百可得的ＥＣ５０为０．２０～０．３５μｇ／ｍＬ，敌力脱、百菌清的ＥＣ５０为０３５～２．０μｇ／ｍＬ，福美双抑菌效果不明显。高抗菌株对乙霉威敏感，而低抗、中抗菌株表现不敏感。

Susceptibitity of some strains of Phomopsis asparagi Sacc to thiophanate methyl(TM) was tested in vitro. The results showed that there were different levels of resistance in field isolates. The inhibitory effect of guazatine, chlorthalonil, diniconazole, thiram, propaconazole, diethofencarb on strains of P asparagi was tested in vitro. EC 50  of diniconazole and guazatine was 0.20～0.35 μg/mL, and EC 50  of propaconazole and chlorthalonil was 0.35～2.0 μg/mL. The inhibitory effect of thiram was not obvious. Highly resistant isolates were sensitive to diethofencarb, the isolates with low or moderate resistance were not.