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Studies on chemical control of a nuisance chironomid midge diptera chironomidae 2. chemical control of the midge larvae in a sewage treatment plant by dripping technique and the effects of chemicals on microorganisms in activated sludge



Studies on chemical control of a nuisance chironomid midge diptera chironomidae 2. chemical control of the midge larvae in a sewage treatment plant by dripping technique and the effects of chemicals on microorganisms in activated sludge



Medical Entomology and Zoology 36(4): 295-302



Heavy infestations of larvae of Chironomus yoshimatsui occurred in a sewage treatment plant in Tokyo. In this plant, the final sedimentation tanks, overflow gutters, disinfective tanks, and discharge channels, having relatively low BOD levels, are the specific sites of high densities of the midge. In field studies, teh relative efficacy of a WP formulation of temephos and chlorpyrifos-methyl WP aginst C. yoshimatsui in overflow gutters were assessed by dripping different concentrations of the larvicides for different lengths of time. Although no remarkable difference was observed in the efficacy of the two chemicals against C. yoshimatsui at treatment rates of 0.5 ppm for 120 min, 1 ppm for 60 min, 2 ppm for 30 min, and 4 ppm for 15 min, chlorpyrifos-methyl showed slightly superior activity than temephos. Successful larval control in the plant was achieved by dripping either chemical from oxidation tanks into connecting channels at a rate of 2 ppm for 30 min. The two larvicides and the IGR diflubenzuron applied at rates as high as 5 ppm for 60 min had slight impact on the function of the activated sludge in the system.

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Accession: 006505465

Download citation: RISBibTeXText

DOI: 10.7601/mez.36.295


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