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目的了解不同杀蚊幼剂对蚊幼的杀灭效果,为今后防治蚊幼提供科学依据。方法选择水体,随机分为试验组和对照组,于试验前后一定间隔分别测定幼虫密度,并计算出密度指数、相关密度指数(PR I)和杀灭率。试验时分别将试验药剂施放于水体中(施药剂量:毒死蜱0.5、1 g a.i/m3;双硫磷1 g a.i/m3;马拉硫磷2 g a.i/m3)。结果2种剂量毒死蜱投药后1 d对蚊幼虫杀灭率均为100%,前者持效66 d,后者为69d;施药剂量为1 g a.i/m3双硫磷施药后1 d仅发现1只蚊蛹,杀灭率达99.76%,2 d达100%,投药后65 d时仍达80.56%;2 g a.i/m3马拉硫磷施药后7 d杀灭率为100%,12 d时为85.59%,14 d降至55.18%。结论结果表明,对幼虫杀灭效果及持效期优劣依次为:毒死蜱>双硫磷>马拉硫磷。建议今后水体灭蚊幼时,在条件允许的情况下,推荐使用前者。
Objective To understand the killing effects of different mosquito-killing agents on mosquito larvae and provide a scientific basis for the prevention and control of mosquito larvae in the future. Methods Water bodies were selected and randomly divided into experimental group and control group. The density of larvae was measured at certain intervals before and after the experiment, and the density index, correlation density index (PRI) and killing rate were calculated. Test were applied to the test agent in the water (application dose: chlorpyrifos 0.5,1 g a.i / m3; disulfide 1 g a.i / m3; malathion 2 g a.i / m3). Results The killing rates of two kinds of chlorpyrifos on mosquito larvae were 100% on the 1st day after dosing, the former was 66 days and the latter was 69 days. Only 1 g ai / m3 of diphtheria was found on day 1 1 mosquito pupae, the killing rate reached 99.76%, reached 100% on the 2nd day and reached 80.56% on the 65th day after dosing. The killing rate of malathion at 2 g ai / m3 was 100% 7 days after spraying 85.59% for d and 55.18% for 14 days. Conclusion The results showed that the killing effect and persistence of larvae were: chlorpyrifos> diphtheria> malathion. Recommended water mosquito childhood, in conditions permitting, it is recommended to use the former.