title: Resistance of German cockroach (Blattella germanica) to DDT and Propoxur in some parts of Bulgaria.
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.
authors.affiliation: Department of Epidemiology, Research Institute of Infections and Parasitic Diseases Med. Acad., Bulgaria.
authors.forename: G
authors.initials: G
authors.lastname: Gecheva
mesh_terms: D000818:Animals; D002031:Bulgaria; D003058:Cockroaches; D003634:DDT / Q000494:pharmacology*; D007300:Insect Control / Q000379:methods*; D007305:Insecticide Resistance / Q000502:physiology; D001074:Propoxur / Q000494:pharmacology*
chemical_list: D001074:Propoxur; D003634:DDT