嘧菌·己唑醇对水稻纹枯病室内抑菌活性与田间防治效果

Antifungal Activity of Azoxystrobin·Hexaconazole against Rhizoctonia solani in Laboratory and Its Control Effect in Field

室内毒力测定结果表明:嘧菌酯与己唑醇以2∶3、1∶2、1∶3配比均可,其中嘧菌酯与己唑醇以1∶2复配的制剂EC50为0.00791μg/mL,SR50为1.55。田间防效试验表明:24%嘧菌.己唑醇SC 375 mL/hm2、450 mL/hm2与24%噻呋酰胺SC 360mL/hm2,三处理之间差异不显著,但均与24%嘧菌·己唑醇SC 300 mL/hm2、10%己唑醇SC 750 mL/hm2、250 g/L嘧菌酯SC375 mL/hm2差异显著或极显著。24%嘧菌·己唑醇SC 375～450 mL/hm2(推荐用量)与24%噻呋酰胺SC 360 mL/hm2的防效相当,但成本低,性价比高,同时能兼治稻曲病、稻瘟病,达到一药多治效果,对水稻生育安全,无药害,且能使水稻叶片增绿,增强生长势等作用。

The results of the toxicity test in laboratory showed that Azoxystrobin and Hexaconazole could be mixed at the ratio of 2∶3,1∶2 or 1∶3,and its EC50 and SR50 against Rhizoctonia solani were 0.00791 μg/mL and 1.55 respectively,when they were mixed in the proportion of 1∶2.The results of field test revealed that the 3 treatments of applying 24% Azoxystrobin·Hexaconazole SC at the dose of 375 mL/hm2 or 450 mL/hm2,and 24% Thifluzamide SC at the dose of 360 mL/hm2 had no significant difference in control effect against Rhizoctonia solani,but their control effects were significantly different from those of the treatments of applying 24% Azoxystrobin·Hexaconazole SC at the dose of 300 mL/hm2,10% Hexaconazole SC at the dose of 750 mL/hm2,and 250 g/L Azoxystrobin SC at the dose of 375 mL/hm2.The control effect of 24% Azoxystrobin·Hexaconazole SC at the dose of 375~450 mL/hm2（recommended dose） was similar to that of 24% Thifluzamide SC at the dose of 360 mL/hm2,but the former not only had low cost and high cost performance,but also could control false smut and rice blast.The application of 24% Azoxystrobin·Hexaconazole SC at the proper dosage was safe to rice plants,and could promote the leaf greening and growth of rice.