Abstract
1) Field experiments on the insecticidal effects of 5% Nankor emulsion on larvae of mosquitoes, Culex pipiens pallens, Aedes albopictus, Aedes japonicus and Aedes togoi, in ditches and reservoirs were carried out in Kyoto City, in August, 1963. 2) By the application of 5% Nankor emulsion to the ditches at the rate of 16.67ppm of active ingredient to the whole water, all larvae and most of pupae disappeared after one day. Reapperrance of larvae occured after 16-25 days. 3) By the application of 5% Nankor emulsion to the reservoirs at the rate of 16.67ppm of active ingredient to volume of water, all larvae and most of pupae disappeared after one day. Effective period was more than 25 days, being longer than that in the ditches.
