Insecticide-Induced Dispersal in the German Cockroach, Blattello germanica (L.) (Orthoptera: Blattellidae)

摘要

Dispersal of a laboratory susceptible strain (VPI) of German cockroaches, Blattella germanica (L.), was compared with that of a field-collected, propoxur-resistant strain (BP) in laboratory experiments. VPI-strain adults dispersed significantly faster from 18.9-liter aquaria than BP strain adults after exposure to vapors of a formulation of 1% propoxur in oil. No differences occurred in control experiments or between dispersal of VPI and BP middle-instar or early instar nymphs. Early instars of both strans dispersed the least but found refuge in water-vial sponges. Reasons for decreased avoidance by the BP-resistant strain are discussed.