8种杀菌剂对水稻稻瘟病菌的室内毒力测定及苗期防治效果

Indoor Toxicity Measurement and Control Effects at Seedling Stage of 8 Fun⁃gicides against Pyricularia oryzae

采用生长速率法测定了8种杀菌剂对稻瘟病菌的室内毒力,并通过温室试验测定杀菌剂对稻瘟病的防治效果。结果表明,咪鲜胺对菌丝生长的抑制作用最强,EC50为0.692 mg/L。稻瘟酰胺、多菌灵、肟菌·戊唑醇和碱式硫酸铜的EC50均小于3.0 mg/L,抑制作用较强。多菌灵的EC90最小,为1.929 mg/L。咪鲜胺、稻瘟酰胺、多菌灵和肟菌·戊唑醇对水稻叶瘟保护效果最高,防效达到73.3%~76.4%。该试验可为东北稻区筛选防治水稻稻瘟病的高效杀菌剂提供参考。

Toxicities of 8 fungicides were determined according to the inhibitory rates of the blast fungi mycelia growth in media containing the fungicides,and the control efficiency of the fungicides were evaluated by greenhouse test.The results showed that prochloraz was the most effective against the mycelial growth with the EC50 value of 0.692 mg/L.The EC50 values of fenoxanil,carbendazim,trifloxystrobin·tebuconazole and copper sulfate basic were less than 3.0 mg/L,showing strong inhibitory effect.The EC90 of carbendazim was 1.929 mg/L and was the lowest.Prochloraz,fenoxanil,carbendazim and trifloxystrobin·tebuconazole showed the obviously protective effect on rice leaf blast,which were 73.3%-76.4%,respectively.The experiment provides suggestion for screening effective fungi⁃cides and controlling rice blast in northeast China.