Abstract
Suseptibility to insecticides in the giant water bug, Diplonychus major Esaki, was examined. The test insecticides were organophosphates (fenitrothion ), pyrethroids (ethofenprox and cycloprothrin), and neonicotinoids (imjdaoroprid)、The giant water bug showed high susceptibility to pyrethroids, ,i.c., , LG50s of ehhofenprox and cycloprothrin were 0.89 and 1.77μg / L, respectively. LC50s of fenitrothion and imidacroprid were 24.6 and 54.7 μg / L, respectively. respectively.
