妙高高原におけるブユ幼虫駆除の研究

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The studies on the control of blackflies or Simuliidae were carried out in Myoko Mountain Area, a part of the National Park of North Honshu. Fifty percent DDT wettable powder and 40% DDT paste containing 1.6% lindane were used in these experiments. The larvae of Simulium aokii and S. uchidai were found to be erradicated for the distances of 800 to 1, 000 meters along the stream when 1.2ppm of DDT was applied for 10 minutes. The time required for the detachment of larvae from their habitats were found to be shorter in the cases of DDT paste, and was correlated with amount of DDT applied. Third and 4th stage larvae of S. aokii resisted for longer periods to the insecticide than in younger or older stages. Larvae of S. japonicum were found to be more resistant than other species. A total of 11 species of Simuliidae were collected from this area. Their areal and seasonal distributions were observed through extensive surveys made over a year's period. The control of blackflies was made on the resort area of 24 square kilometers covering about 50 streams which bred the larvae. DDT paste and wettable powder were applied to the streams by the ratio of 10ppm of the effective agents against the water amount flowing in a minute. The applications of the insecticides were made by the interval of a month, seven times from May to December. A total of about 76kg of paste and 4.8kg of wettable powder was consumed during this period. Remarkable decrease of the larvae as well as the adults of blackflies could be attained through these control works. Almost all of the streams running through this area became free from larvae, and the damages caused by the biting of adults in the summer season were found to be much lower than in the preceding year.
日本衛生動物学会の論文
1956-12-05

妙高高原におけるブユ幼虫駆除の研究

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