Field evaluation of fenitrothion, chlorpyrifos-methyl and propetamphos against German cockroach, Blattella germanica (L.)

Abstract

Effects of the following three organophosphorus insecticides were tested against the German cockroach, Blattella germanica L., in four restaurants in Shizuoka during the summer of 1988: 1) 10% fenitrothion EC diluted to 20-fold (Fe-20); 2) mixed EC of 3% propetamphos and 2% dichlorvos diluted to 10-fold (Pr-10) and 15-fold (Pr-15); 3) mixed EC of 5% chlorpyrifosmetyl and 2% diclorvos diluted to 10-fold (Ch-10). Both Pr-10 and Pr-15 functioned more rapidly than Fe-20 or Ch-10, and kept higher lethal effects than Fe-20. The lethal effect over 90% for Pr-15 was maintained for about 45 days, and those for Pr-10 and Ch-10 were nearly for three months. Hence, the propetamphos-dichlorovos mixture is excellent in the rapid effect, the lethal effect and the residual effect against the German cockroach.