Development and decrease of resistance of house flies to diazinon

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  • 各種昆虫の殺虫剤に対する抵抗性の研究 : 第 8 報イエバエの diazinon に対する抵抗性の発達と消失について
  • 各種昆虫の殺虫剤に対する抵抗性の研究-8-
  • カクシュ コンチュウ ノ サッチュウザイ ニ タイスル テイコウセイ ノ ケンキュウ 8

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In late 1960 and early 1961, increased dosages and resprayings of diazinon failed to kill the house flies in several localities of Ibaragi and Chiba Prefectures. Collections were made subsequently, from ten of these localities in order to carry out a comparison with the normal Takatsuki or the resistant RP strain of houseflies. 1. As regards the development of resistance to diazinon the results of the experiments in the laboratory can be summarized as follows : On topical application, flies from Mihara in Hokota, Obata in Ibaragi and Hamajuku in Sodegaura showed an increased (LD)_<50> values, 10-20 times, that of Takatsuki strain. A 10-fold increase in resistance could be sufficient to invalidate organophosphorus compound as residual spray (as described by Keiding in 1956). At the 5 or 6th generation of further selection with diazinon these resistant flies in the laboratory had become 2 or 4 times as diazinon resistant as the populations originated. On the other hand the Hikone population, which was highly resistant to chlorinated hydrocarbons, gained only 2-fold tolerance to diazinon after 8 generations of diazinon-pressure. Hokota flies at the F_6 under diazinon-pressure showed resistance level about 100 times of the normal (Takatsuki) strain to diazinon. Houseflies taken early in 1961 from Kamigo district, Dejima Village in Ibaragi Prefecture, which had been treated with diazinon for one year, proved to be 4.7 times as resistant as the population in 1960. Another collection in 1960 from Sueyoshi district, Obitsu Village in Chiba Prefecture, which had been treated with diazinon during 1958-60, showed a 8-fold resistance. 2. The RP strain when kept in laboratory-showed no decrease of resistance even after 46 generations. Although flies taken from Hokota and Ibaragi and bred for five generations without further exposure to diazinon showed a slight fall in the levels of diazinon resistance, they were still considerably resistant to this insecticide. 3. These resistant houseflies showed resistance levels of from 10 to 20 times of the normal ones against diazinon, but only of 2-4 times of the normal to the other insecticides, i.e. DDVP, malathion, Nankor and Baytex.

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