氰戊菊酯和敌敌畏在豇豆上的残留消解动态研究

The Degradation of Fenvalerate and DDVP in Cowpeao

本文采用田间试验的方法研究了氰戊菊酯和敌敌畏在豇豆上的残留消解动态。结果表明,氰戊菊酯的半衰期为2.5天,敌敌畏1天后消解90％以上。高浓度施药2次,3天后残留量均低于FAO/WHO关于这两种农药的最高允许残留量(MPL)(1mg/kg和0.5mg/kg),据此提出了安全使用标准的建议。

The degradation of two insecticides-fenvalerate and DDVP in Cowpea was investigated in field. The experiment showed that the half life of fenvalerate was 2.5 days and only 10％ of DDVP was left 24 hours after the spray. Even when these two insectcides were applied at rather high concentrations (1: 1500 of 20％ fenvalerate; 1: 500 of 80％ DDVP), the residues were still less than their MRL. Based on our experiment, tile standard for safe use of these two insectcides was recommended.