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Chemical control of the chironomid larvae diptera chironomidae in the polluted river in reference to the controlled area and the mortality of the intoxicated larvae carried by the stream



Chemical control of the chironomid larvae diptera chironomidae in the polluted river in reference to the controlled area and the mortality of the intoxicated larvae carried by the stream



Medical Entomology and Zoology 29(2): 87-92



Chemical control of chironomid larvae was investigated in 2 rivers, Zenpukuji and Nogawa, of Tokyo [Japan]. The River Zenpukuji with a moderate current was treated with temephos W. P. [wettable powder] for 60 min at 1 ppm. Seven days after treatment, larval population was reduced 80% in the area from the treatment spot to the 500 m point downstream, and by less than 70% at the 900 m point downstream. The number of 1st-instar larvae resurged 10 days after treatment. The River Nogawa (Koganei City, Tokyo) was treated with temephos W. P. for 60 min at 1 ppm. Four days after the treatment, there was no larval population of midge in the area from the treated spot to the 3,100 m point downstream, but young instar larvae resurged 8 days after the treatment. One mo. after treatment, the larval population was larger than the pre-treatment period. The 2nd test in the same river with 0.68 ppm treatment for 60 min resulted in inferior control, which is attributable to the differences in chemical concentration and the low temperature (24.degree. C vs. 19.degree. C). Within hours after treatment, a number of larvae and pupae were carried away; most of them were dead. All intoxicated larvae were observed to die in 72 h under laboratory conditions. A portion of larvae which survived in mud tubes after the treatment emerged into adults.

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Accession: 004937599

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DOI: 10.7601/mez.29.87


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