Laboratory bioactivity test and field efficacy of diafenthiuron·tolfenpyrad 25％suspension concentrate against Empoasca pirisuga Matsumura
The study aims to evaluate the field efficacy of diafenthiuron·tolfenpyrad 25％suspension concentrate(SC)against Empoasca pirisuga Matumura.The combined toxicity of 98％diafenthiuron and 95％tolfenpyrad at different ra-tios to E.pirisuga Matsumura was determined by the method of co-toxicity coefficient,at the same time,field efficacy comparison tests between two places were carried out with diafenthiuron·tolfenpyrad 25％SC 112.5,150.0 and 187.5 g·hm-2,diafenthiuron 25％SC 750.0 g·hm 2 and tolfenpyrad 30％SC 90.0 g·hm-2.Highest co-toxicity coefficient was 144.21 in the mixture of diafenthiuron and tolfenpyrad at the ratio of 2:3.The diafenthiuron·tolfenpyrad 25％SC can control E.pirisuga Matumura rapidly and had great duration,the field efficacy results in Chang'an village and Lingx-ia village showed that the field efficacy of diafenthiuron·tolfenpyrad 25％SC was 67.55％-76.87％and 86.24％-93.33％after applying 1 d,and the field efficacy was 89.50％-95.29％and 85.53％-92.74％after applying 7 d.The results show that diafenthiuron·tolfenpyrad 25％SC has good field efficacy on E.pirisuga Matumura.In tea produc-tion,spraying diafenthiuron·tolfenpyrad 25％SC with the dose of 112.5-187.5 g·hm-2 was recommended to control E.pirisuga Matumura.
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