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Outbreak of chironomid midge in a polluted river and the chemical control of the larvae



Outbreak of chironomid midge in a polluted river and the chemical control of the larvae



Medical Entomology and Zoology 26(4): 247-252



Investigations on the chemical control of chironomid larvae were carried out in the Suimon river which runs through the center of Ohgaki City, Gifu Prefecture [Japan]. The river was so heavily polluted due to drainage from the factories that no midge larvae could breed there before the Water Pollution Control Law was enforced in 1971. The midge-swarm problems arose in autumn 1973, because of the enforcement of regulation of the drainage from the factories which improved the biological oxygen demand in the water from 85 ppm in 1970 to 12 ppm in 1974. The density of the larvae per 40 cm3 (20 cm2 .times. 2 cm in depth) of the bottom mud was estimated from 126 to 186 before the river was treated with temephos. In the laboratory test, 45% of the tested larvae were killed and the survivals were intoxicated at 12 h after treatment when they were dipped into 0.8 ppm active ingredient (AI) of temephos WP [wettable powder] for 60 min. In the field test, the river was treated with the temephos WP for 60 min at 1 ppm of the flowing water volume. At 9 days after treatment, no midge larvae were found at about 1.6 km downstream from the application spot. Temephos showed no poisonous effects on a loach up to 10 ppm in the laboratory test. A loach, carp, crucion and top minnow habitating the river were not affected by the temephos treatment.

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Accession: 006049194

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DOI: 10.7601/mez.26.247


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