The insects crowding on the room lamps and their control : 1. Daily fluctuation of the activity

Abstract

The insects crowding on the lamps of living rooms make us very uncomfortable. The authors are attempting to control these insects by using light trap. In the present paper, the authors report the constitution of the insects and their daily fluctuation in numbers, attracted to a light trap situated at the bank of the River Seta, Siga Prefecture, in July 5-6, 1958. In this station, many caddisflies, mayflies and dipterous insects were caught. Their daily fluctuation were shown in Fig 1. Caddisflies were most abundant from sunset to 9 p.m.. Mayflies showed the peak between 9 to 10 p.m. Dipterous insects (chiefly a species of sand-fly) were showed the peak 11 to 12 p.m. The flying activity of these insects seemed to begin from the sunset and to end before the midnight.