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KMID : 0438219720090010399
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Korea University Medical Journal
1972 Volume.9 No. 1 p.399 ~ p.410
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Studies on the Joint action of Organophosphorous Compounds and Chlorinated Hydrocarbons to Mosquito larvae of Culex pipiens and Culex tritaeniorhynchus
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Abstract
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Since the first report appeared in 1947, concerning the development of Hewlett and Plackett (1950) and Sakai(1966) insecticide-resistance by vectors, many workers have studied on the joint action of insecticide mixtures as a mean of minimizing resistance development. In 1958 Wheeler reported that Korean houseflies were more sensitive to DDT in comparison with those of Japan. Subsequently, Paik(1959), Kim and Koo(1962), Kim(1964), Kyung(1968), Kim(1969) and Lee (1971) observed more details of a resistance problem testing practically all sorts of insecticides in common use. The results indicate that insecticides of chlorinated hydrocarbons no longer exert powerful knock-down effects, which would require use of insecticide mixture for the , effective control of disease vectors. In this respect, K. Kim (1969) made an observation on the joint action of certain insecticides which were applied to houseflies in different time intervals.
The present paper describes the result of mosquito larvicidal effects exerted by the mixture of organophosphorous compounds and chlorinated hydrocarbons in a ratio of one to one proportion. The larvae of Culex pipiens and tritaenioryhychus were collected from the suburbs of Seoul city and reared in the insectary. Insecticides used were DDT, γ-BHC dieldrin malathion, sumithion, diazinon, DDVP and cyanox, twenty larvae of 3rd and 4th instar were used in each test and mortalities were computed from the average of two tests replicated. These results were statistically treated with probit analysis and transformed into regression lines for dosage mortality comparison.
The result may be summarized in the following:
1. Out of single insecticides tested, houseflies were most resistant to γ-BHC, but least resistant to both sumithion and cyanox.
2. The synergistic joint action was markedly observed in the mixture of sumithion with chlorinated hydrocarbons while the mixture of cyanox showed a decreased joint action.
3. There was no difference between the mosquito species of Culex pipiens and tritaeniorhynchus with respect to insecticide tolerance.
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