Ecological studies on the overwintering of mosquitoes, especially of Culex tritaeniorhynchus Giles in Osaka Prefecture : 1. Notes on the dry ice- and emergence-trapping in spring at terraced rice field areas, 1967-1975

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  • 大阪府における越冬蚊の生態, とくにコガタアカイエカの越冬に関する研究 : 1. ドライアイストラップとエマージェンストラップによる採集成績
  • オオサカフ ニ オケル エットウ カ ノ セイタイ トクニ コガタアカイエカ

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Abstract

During the spring of 1967-1975,overwintered mosquitoes were collected by using dry ice-traps at terraced rice field areas of 14 localities in Osaka Prefecture. More Culex tritaeniorhynchus were collected from izumi-Mibayasi area than from any other areas. The collection site at Izumi-Mibayasi area was on the terrace in the middle of the River Makio, and characterized by clusters of the eulalia Miscanthus sinensis along the banks between terraced rice fields. Eighty-four emergence-traps were placed over the side of grassy banks or stone walls between rice fields in the early spring of 1968-1970. None of the traps yielded any Cx. tritaeniorhynchus. One trap yielded a single female of Cx. pipiens pallens each at Simamoto area and Higasiosaka-Kamisizyo area. At Izumi-Mibayasi area one trap yielded two females of Cx. pipiens pallens plus five females of Anopheles sinensis, and another yielded two females of An. sinensis. A total of 99 pools of Cx. tritaeniorhynchus (5,075 females) were inoculated into suckling mice. No virus was isolated.

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