Abstract
As a case of insect nuisances of summer season two kinds of the moth flies, Psychoda alternata Say and Telmatoscopus albipunctatus Williston, which are common in various districts of Kanagawa Prefecture, was in vestigated. The life history of Telmatoscopus albipunctatus was observed in the laboratory by dry yeast feeding under the conditions of 27℃, 85% relative humidity and L12 : D12 in photoperiodism. The egg period was 2 days, larval stages ranged 10-14 days (I, II, III and IV instar periods), pupal period was 3 days and adult life lasted from 2 days to 20 days (average 7 days). Preoviposition period was 3 days, and the total number of eggs per one female was considered to be 250. Relative effectiveness of 9 insecticides was tested against larvae of Telmatoscopus albipunctatus by the dilution immersion method with suspending filter papers. The LC 50 values were 0.26ppm for Baytex, 0.81ppm for Sumithion, 1.9ppm for Dipterex, 4.3ppm for Malathion, 5.2ppm for Lindane, 8.5ppm for DDVP, 9.1ppm for DDT and 71ppm for Sevin. It was obvious that the moth fly (Telmatoscopus albipunctatus) larvae have, in general, resistance levels to the insecticides tested. It is, therefore suggested that chemical control measure of the adult moth flies, in in practice desirable.
