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KMID : 0353019680050020195
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Korean Journal of Public Health
1968 Volume.5 No. 2 p.195 ~ p.198
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Studies on the Effectiveness of Insecticides against Public Health Important Insects in Korea
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Abstract
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In Korea, up to date, there are no extensive and basic researchs on effectiveness of insecticides to control vectors, even there has not been established the base line data of insecticide susceptibility for the main vector of Japanese encephalitis, Culex tuitaeniorhynchus summorosus.
Author carried out the insecticide susceptibility test for Culex tritaeniorhynchus larvae, which were reared from eggs laied by wild-caught adults in the vicinity of Seoul, through WHO test method during the summer of 1968.
He has computed LC-??´s of three insecticides, premium-sumithion, fenthion, and tech-DDT against the vector by means of Finney´s graphic approximate method. The results were summarized and compared with the results obtained in Japan and Okinawa as follows.
1. The larvae were highly susceptible to organophosphorous insecticides, sumithion and fenthion, especially to the former and they were less but considerably susceptible also to the chlorinated hydrocarbons, tech-DDT.
LC-??´s of three compounds were 0.00113 ppm in sumithion, 0.00182 ppm in fenthion and 0.00935 ppm in tech-DDT.
2. Comparing LC-??´s with those of Japan and Okinawa, it can be pointed out that, to the sumithion, Seoul strain is about 3.5 times more susceptible than Japan strain, while to the fenthion, all Seoul, Japan and Okinawa strains show almost the same susceptible levels.
In case of tech-DDT, Seoul strain was 7 times less susceptible than Japan strain, while it is almost as same value as Okinawa susceptible strain.
3. It is interesting to mention that Culex tritaeniorhynchus larvae of Seoul strain was susceptible to tech-DDT, for all adults of Chung-up strain of the species showed intermediate type of resistance.
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