title: Development and evaluation of Blattella germanica and Periplaneta americana resistance to dichlorvos in Bulgaria.
abstract: Seven wild populations of Blattella germanica (L.) originating from five regions and two populations Periplaneta americana (L.) from two regions of the country were tested for susceptibility to dichlorvos. A standard method recommended by WHO was used. The results obtained showed resistance in German cockroach populations from four regions with resistance index 5.3x ... 31.1x at LT50 and 6.1x ... 39.8x at LT90. Three percentage resistant nymphs of P. americana from Sofia city have been established.
authors.affiliation: National Center of Infectious and Parasitic Diseases, Sofia, Bulgaria.
authors.forename: G
authors.initials: G
authors.lastname: Gecheva
authors.forename: G
authors.initials: G
authors.lastname: Ranchov
mesh_terms: D000818:Animals; D002031:Bulgaria; D003058:Cockroaches; D004006:Dichlorvos; D005260:Female; D007305:Insecticide Resistance; D007928:Lethal Dose 50; D008297:Male; D009758:Nymph; D010526:Periplaneta; D012737:Sex Factors
chemical_list: D004006:Dichlorvos