Studies on the massive flights of chironomid midges (Diptera : Chironomidae) as nuisance insects and plans for their control in the Lake Suwa Area, Central Japan.

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In the area surrounding Lake Suwa, massive flights of adult midges have been recurring, causing problems in the daily life of local residents. In this paper, we gave an outline of adult midges of chironomidae in recent years, including : (1) characteristics of main chironomid species ; (2) factors encouraging massive flights of midges from the lake to human habitats ; and (3) the relationship between human activities and adult midges. Moreover, we examined the countermeasures for their control : (1) studies on flight behaviour and resting habit of adult midges ; and (2) the field trial trapping control method of adult midges by attracting them to lights and sounds in Lake Suwa. Any plans which effectively promote the ideal of human coexistence with other organisms as auxiliary measures must be examined.