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目的评价倍硫磷缓释包防治白纹伊蚊幼虫的效果。方法应用生物测试法测定药剂敏感性,气相色谱法测定药物释出浓度,模拟现场法评价防治效果。结果广州市各地区的白纹伊蚊幼虫对倍硫磷敏感,抗性倍数均在2以下。在半年内,不换水情况下投放在2 L水中倍硫磷颗粒剂和倍硫磷缓释包平均释出药物分别为5.73和0.242 mg/L,变异系数分别为50.12%和40.33%;每周换1次水情况下投放在2 L水中倍硫磷颗粒剂和倍硫磷缓释包平均释出药物分别为1.965和0.087 3 mg/L,变异系数分别为215.73%和92.21%;两种包裹方式均能致死受试的试虫,但缓释包比颗粒剂释出药物更稳定;倍硫磷缓释包控制野外小型积水容器的白纹伊蚊幼虫可长达1年以上,而颗粒剂只有不到半年的防效。结论倍硫磷缓释包适合广州地区白纹伊蚊的应急控制。
Objective To evaluate the effect of fenthion sustained-release package against Aedes albopictus larvae. Methods The bioassay method was used to determine the drug susceptibility. The concentration of drug released was determined by gas chromatography. The effect of prevention and treatment was evaluated by field simulation. Results Aedes albopictus larvae were sensitive to fenthion in all regions of Guangzhou. The resistance multiple was below 2. In the first half year, the average release of drugs in 2 L of water, fenthion granules and fenthion sustained-release tablets were 5.73 and 0.242 mg / L, respectively, with coefficient of variation of 50.12% and 40.33% The results showed that the average release of the drugs in the 2 L water of fenthion granules and fenthion was 1.965 and 0.087 3 mg / L, respectively, and the coefficients of variation were 215.73% and 92.21% However, the slow release package is more stable than the granular release drug; the fenthionine Aedes albopictus larvae that control fentanyl mosquito larvae in the field for a long time can control for more than one year, Granules less than six months of anti-efficacy. Conclusion Fendio slow release package is suitable for emergency control of Ae. Albopictus in Guangzhou.