Abstract
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 strains dispersed the least but found refuge in water-vial sponges. Reasonsfor decreased avoidance by the BP-resistant strain are discussed.
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