Studies On Aedes Albopictus And Its Natural Enemy Culex Fuscanus

Aedes albopictus is considered to be an important medical insect which extensively distributes in the world. It has big population and a long period of activities. It prefers stinging the blood of human and is the vector of Dengue Fever and Meningitis. The characters, biology, oviposition habits and the seasonal distribution of Aedes albopictus were investigated. The effect of different kinds of containers and water quality on the fecundity of Aedes albopictus and the methods of rearing Culex fuscanus with the larvae of Aedes albopictus were studied.The results showed, by the investigation on oviposition habits of Aedes albopictus, that it laid more eggs in the day time than in the night. The female prefered to lay eggs on the black and rough container surface near the water. Effect of the depth of water in the containers on the fecundity of Aedes albopictus wan not significant. The experiments showed that Aedes albopictus could grow in all kinds of containers and water quality, but the rain water and rubber container were the most suitable for the mosquito to breed. The larvae were found in the mid-March and the adults could be seen in the late March or April. The occurrence peak of adults was between July and September. They couldn't be found from the late October to the early March.Ciilex fuscamis is an important predator of many kinds of mosquitoes.The effect of prey density on the individual number consumed by Culex fuscamis and relationship between the density of Culex fuscanus and consumed prey individual number were investigated. The methods of mass rearing and utilizing of Culex fuscanus were introduced. According to the experiments in the functional responses, the higher density of the prey was supplied for Culex fuscanus, the higher proportion of the 4th instar larvae of Aedes tilbopictus was consumed. The consumed number of the prey decreased when the natural enemy density increased. When offered a mixture of different species and stages of larvae of prey, the 411 instar larvae of Culex fuscanus prefered the 4th larvae of Aedes albopictus to Culex quinquefasciatus and prefered larvae to pupae of the prey. Size, density and mobility of the prey influenced the host selection of Culex fuscanus.