不同温度条件下甲胺磷对荔枝蝽卵平腹小蜂的毒效实验

Toxicity of Methamidophos to Anastaus japonicus Ashmead under different temperatures

采用喷雾气压恒定为１９６．１３３ ｋＰａ、时间自动控制为３ ｓ的ＺＨＬ９７型喷雾器对荔枝蝽卵平腹小蜂喷雾甲胺磷．结果表明，在２２～３０ ℃、（７０±５）％ ＲＨ、１４ Ｌｖ１０ Ｄ光照条件下，甲胺磷对荔枝蝽卵平腹小蜂的毒性随温度的升高而增大， ＬＣ５０为甲胺磷田间推荐使用浓度稀释倍数（１ｖ１ ０００）的２２～４８倍（即１ｖ２２ ０００～１ｖ４８ ０００）．

Indoor experiment was conducted to test the toxicity of 50% Methamidophos to the dominant parasitoid, Anastatus japonicus Ashmead, of Tessaratoma papillosa . The constant environmental conditions were 22-30 ℃, (70±5)% RH and 14 L∶10 D and the spray air pressure for methamidophos was 196.133 kPa with 3 seconds of spray time. Results indicated that the LC 50 of Methamidophos was ranged between 1∶22 000 and 1∶48 000 due to different temperatures;by contrast, the recommended consistency is 1∶1 000 for pest control in the field application. The regressions of the toxicity of Methamidophos on the motility of A.japonicus were also mentioned.