蚊の Age に関する研究 V. : アカイエカ幼虫駆除が成虫の Age 構成に及ぼす影響

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During the early summer in 1963 an enormous number of mosquitoes had become a tremendous nuisance among the inhabitants in an area of Omiya district, the vicinity of Tokyo. The only one main breeding place was found to be a stagnating irrigation creek running through by the area. The control of mosquito larvae was carried out in the end of May by spraying floating dust of 3 per cent of Baytex on the surface of the creek along about one kilometer of length. Then the complete change on the breeding place was achieved by spilling the water away into rice paddy fields which followed a few days after the insecticide spraying. Observations on the density and the age composition of the adult population were carried out before and after the larval control for the period of one and a half of months. Collection of mosquitos was done in a station located about a half kilometer from the creek using light traps, dry ice-mosquito net traps and inside resting collections in a chiken hut. The population density was observed to show a rapid decrease after the control and by the time of two weeks after the control it reached a minimum, that is, about 10% of the original level before control. Thereafter the population recovered gradually and regained its original size in the beginning of July. The age determinations were done according to the Detinova's method and the number of relics for individual mosquito were recorded. The parous rates individual mosquito were recored. The parous rates indicated 9.3% and 8.3% for the collection by dry ice method and by resting collections respectively before the control. Two weeks after the control they reached up to 91.7% and 57.4% then dropped again to 11.0% and 4.0% respectively in the beginning of July. It is obvious that the changes in the parous rate were reversely correlated with the transition in the density. A fact that a remarkable increase of parous rate was encounterred in two weeks after the control when the depression in the density occurred clearly suggests that the decrease of the population was caused exclusively by the eradication of the larval stage of the mosquito.
日本衛生動物学会の論文
1965-09-30

蚊の Age に関する研究 V. : アカイエカ幼虫駆除が成虫の Age 構成に及ぼす影響

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