Abstract
Rodenticidal effect, suitable concentration, repellency and taste of some rodenticides, i.e., G-100 (coumarin-3-carboxylate), Tl2SO4 and Warfarin [3-(α-Acetonyl benzyl)-4-hydroxycoumarin], etc., were examined in houses, store house cafe and so on, where the wild rat lived or stealed in. It was found that G-100 and the mixture [G-22 (6-coumarinylamine-coumarin-3-carboxylate) : G-100=2 : 1] had relatively good rodenticidal effect and that suitable concentration of the drugs to gain the rodenticidal effect within 2 or 3 days were 0.3% with solid type, 3% with paste type and 3% with powder type. Then it was found that simultanious control at whole place was necessary for rodenticidal procedure.
