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Resistance of German cockroach (Blattella germanica) to DDT and Propoxur in some parts of Bulgaria.

Gana Gecheva

Abstract

Five field strains of Blattella germanica from different areas of Bulgaria were tested for resistance to DDT. The strain from Sofia-city after 24 hours of exposure was resistant to DDT in terms of mortality by resistant ratio of 3.76 at the LT50 level. Also 5 strains of B. germanica from 3 regions of Bulgaria have been tested to the carbamate insecticide--Propoxur. For the first time in Bulgaria, DDT- and Propoxur-resistant cockroach strains have been found. It is due to female and nymph resistance, while the males are highly susceptible to Propoxur.

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Key concepts: Propoxur, German cockroach, Cockroach, Toxicology, Biology, Carbamate, Nymph, Dictyoptera