50%甲基嘧啶磷乳油现场灭蚊幼实验研究

Efficacy of actellic against mosquito larvae in field

目的观察使用不同剂量甲基嘧啶磷现场灭蚊幼效果，为今后灭蚊幼提供科学依据。方法选择实验场地同时设对照区并测量其水体体积，分别按0．012、0．02、0．1、0．2ga．i／m3剂量施药，定期用勺捞法分别观察其密度。结果施药剂量在0．012ga．i／m3时，施药后1～14d杀灭率为63．03％～92．13％；在0．02ga．i／m3时，施药后1～26d杀灭率为94．93％～99．45％；0．1ga．i／m3时，施药后1—30d杀灭率为75．52％～100％；在0．2ga．i／m3时，施药后1～16d杀灭率为74．15％～100％。结论实验证明，甲基嘧啶磷是控制蚊虫孳生的一种良好的有机磷杀虫剂。但在现场使用时，应根据水体污染状态选择合适的剂量，以达到预期效果。

Objective To study the efficacy of different dosages of actellic against mosquito larvae in field and provide scientific data for controlling mosquito larvae in future. Methods The experimental sites （ including treatrnent and control area ）were selected and the volume of body were measured. Different dosages of aetellic （0. 012, 0. 02,0. 1,0. 2 g a. i/m3 ） were sprayed respectively into the experimental spots. Assessment of pretreatment and post-treatment density was carried out periodically with the ladle catching method in both treated and control area. Results To apply dosages of 0. 012 g a. i/m3 ,the killed rate were form 63.03% to 92. 13% after 1 - 14 d at post- treatment. The killed rate of 0. 02 g a. i/mawere from 94. 93% to 99.45% after 1 - 26 d. The killed rate of 0. 1 g a. i/m3were form 75.52% to 100% after 1 -30 d. The killed rate of 0. 2 g a. i/m3were form 74. 15% to 100% after 1 -16 d. Conclusion The experiments indicate that actellic is good organic phosphorous for controlling mos- quito larvae. It is necessary to choose the suitable dosages according to the pollution condition of water body.