Resistance in the German Cockroach (Orthoptera: Blattellidae): The Inheritance of Diazinon Resistance and Cross Resistance

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Abstract
Reciprocal crosses were performed between a susceptible strain of Blattella germanica (L.) and a diazinonresistant strain which exhibited cross resistance to propoxur, DDT, pyrethrins, and lindane. The progeny of these reciprocal crosses were tested for resistance to all 5 insecticides. All factors conferring resistance in the resistant strain were autosomal in origin, the gene (or genes) conferring resistance to diazinon and propoxur was recessive in nature, and the gene (or genes) conferring cross resistance to DDT, pyrethrins, and lindane exhibited incomplete dominance. Monofactorial inheritance of resistance to diazinon and propoxur appeared to be more probable than multifactorial inheritance. Propoxur resistance may be attributed to a pleiotropic effect of the diazinon resistance gene. Although cross resistance to DDT, pyrethrins, and lindane also may be due to a pleiotropic effect of the diazinon-resistance gene, the possibility of a 2nd genetic system conferring resistance to these 3 insecticides cannot be excluded.

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