关键词: 三带喙库蚊, 滞育, 越冬, 生理年龄组成

Abstract: The paper presents the results of study on the early occurrences and age-compositions of the overwintered mosquito, Cx. tritaeniorhynchus Giles from Feb. to May, 1987 and Feb. to April,1988 in Wuxi, Yangzhou, Jiangsu Province, and Fengxian, Shanghai. It was found that the overwintered females appeared by the end of March and early April in Wuxi and Fengxian. By the middle of April the overwintered females increased sharply. However, a few overwintered females could be caught from livestock sheds when the temperature was over 11℃ during sunset from Feb. to March, for example, one female overwintered was caught in the livestock shed in Fengxian, Shanghai, on Feb. 22, 1988, in which it was warmer (15.3℃). The new larvae and adults of the Cx. tritaeniorhynchus appeared by the end of the April and early May. The occurrence date of the overwintered females in tile Yangzhou, Jiangsu was about one month later titan in the Wuxi and Fengxian. The appearences of the overwintered females were association with the temperature changes, rains, and winds in the early spring. All females caught in the early spring were nulliparous and old ages by the age detection. The inseminative and non-diapausive ratios were 98%, 94%, respectively. The females fed appeared the gonotrophic concordance in the early spring.In addition, the results showed that the overwintered females could not almostbe becaught by the CO₂ traps in the field.