Surveillance on Larva and Adult of Aedes albopictus and the Study of Insecticide in Shanghai

Objective To investigate the breeding habit of Dengue vector- Aedes albopictus and the distribution and the biting behavior of adult and its susceptibility to insecticide in Shanghai. The result is to provide guidance for Dengue control.Methods To collect larva from different areas and container to check the positive rate of larva during April-November and to survey the positive rate of larva during the same time by artificial container; To collect the water which has Aedes albopictus larva or has't Aedes albopictus larva for analysis in lab; To use mosquito net and the personnel hour to collect the adult; To use biting by man to observe the adult biting active related to light and temperature indoor and outdoor; To observe the control effect of several insecticides for Aedes albopictus in Lab and imitate field and field.Results (1) Aedes albopictus larva emerged during April-November in nature,the larva density peak was in June-September, Aedes albopictus larva in artificial container emerged at May, one month later than in nature. (2) The Aedes albopictus larva distribution was extensive, the rate of positive in city was less than that in suburb ( χ 2= 571.01 , P 0.01 ).It distributed in the areas with abound tyres and abolishable goods?park?residential areas and construction field et al. It bred in tyre?jar?vat?bottle and the small container from flower and from house.The Aedes albopictus larva usually breeded in the water which consist of pH 7.34- 7.56 ?chloride 46.43- 98.97 mg/L?dissolved oxygen 3.216 7- 3.161 mg/L and nitrite nitrogen 0.043 5- 0.108 mg/L .(3) The adult emerged in Mary-November, with the density peak during June- September. The adult number with mosquito net was more than that with the personnel hour. (4)During June-September, the peak of biting rate indoor and outdoor were 8∶00- 10∶00 AM and 15∶00-16∶00 PM . The biting active was related with the LUX. (5) The LC 50 of DDVP?deltamthrin?permethrin cypermethrin to Aedes albopictus larva was 0.115 6 ppm ? 0.004 56- 0.000 532 ppm ? 0.003 147- 0.011 5 ppm ? 0.001 931- 0.002 007 ppm respectively. It had no resistance to permethrin and cypermethrin. Temephos?diazinon and pirimiphos-methyl were all effective for Aedes albopictus larva.Conclusion This paper recorded the results of two methods to larva surveillance and two ways to catch adult. The biting active was related with the LUX and the larva breeding. Six insecticides were effective to Aedes albopictus . Aedes albopictus density had dangerous degree in Shanghai; Surveillance should be conducted for population density and vector energy in every year. The study of the control method for Dengue vector Aedes albopictus was carried out.