Susceptibilidade "In Vitro" de amostras de Boophilus microplus (Canestrini, 1887) da Baixada Fluminense, Rio de Janeiro, Brasil, a alguns carrapaticidas organofosforados

Abstract

Engorged females of Boophilus microplus were collected on eight farms in four different municipalities of the State of Rio de Janeiro, in order to establish F 1 laboratory cultures, used to measure the resistance factors (RF) to organophosphurus acaricides. The method used was the "larval immersion test" in commercial dilutions of acaricides, the LC 50 being calculated by probit analysis. All the different samples apresented RF to varying degrees with regard to the compounds used, the lowest values for resistance being noted to Dicrotophos. Evidence was noted suggesting the existance of samples with resistance characteristics different to those already known or suggested in Brazil, namely "Ridgelands" and "Monte Alford" e "Super Ridgelands". This type of resistance could perhaps be of the "Gracemere" type