Ecology of Vector Mosquitoes of Japanese Encephalitis, Especially of Culex tritaeniorhynchus summorosus. : 4. Development of Immature Stages of Culex tritaeniorhynchus summorosus with Particular Reference to Temperature in Spring and Autumn

Eggs of Culex tritaeniorhynchus summorosus laid by wild-caught and laboratorycolonized females were reared to adults under outdoor natural conditions particularly in spring and autumn, and the relation of the developmental period of immature stages of the mosquito to the extrinsic temperature was given. The results indicated that the developmental speed of immature stages given as the reciprocal of period decreases clearly with the drop of temperature and the development hardly occurs at the temperature below about 16℃.