GENETIC-STUDY OF NONAVOIDANCE OF A PYRETHROID RESIDUE BY GERMAN COCKROACHES (DICTYOPTERA, BLATTELLIDAE)

Pyrethroid-resistant German cockroaches settled on papers containing r esidues of a pyrethroid insecticide, Tempo 2. Insecticide-susceptible cockroaches, including nymphs of a field-collected strain (Navy 3), pr owing nymphs, and curly-wing adult males, avoided the treated papers. Crosses between resistant and susceptible strains indicated that nonav oidance was inherited as a partially dominant trait. Data from crosses of F-1 progeny with the susceptible Navy 3 strain at a hypothesis of control by a single major gene. Segregation with Pw was indicative of linkage, but not of close linkage, Tests with Cu fit a hypothesis of i ndependent segregation.