Abstract
The poisoning effect of agricultural insecticides on domestic animals has been brought to light quite recently throughout Japan. It is generally believed that the marked recent decrease in mosquito population is largely due to the use of insecticides. In this connection we carried out experiments on larval mosquitoes, freshwater fishes and snails with 2-4D, BHC, Folidol, Endrin, D-N emulsion, Neo-Gikulon, etc. Folidol killed larval mosquitoes (4th instars) in 2 days at a dilution of 0.1 p.p.m., which is in general use in this area. Endrin was selectively destructive on fishes though believed harmless to man and domestic animals.
