caa a22 4500 445341017 CHVBK 20180317142812.0 cr unu---uuuuu 170323e20111101xx s 000 0 eng 10.1007/s00436-011-2423-3 doi (NATIONALLICENCE)springer-10.1007/s00436-011-2423-3 Resistance differences between chlorpyrifos and synthetic pyrethroids in Cimex lectularius population from Denmark [Elektronische Daten] [Ole Kilpinen, Michael Kristensen, Karl-Martin Vagn Jensen] Bed bug, Cimex lectularius L., populations were investigated for resistance against permethrin and chlorpyrifos in a topical application bioassay, after an initial establishment of a discriminating dose with a susceptible population. For both insecticides, ca. two times the lethal dose LD99 was selected: 2,560ng of permethrin and 200ng of chlorpyrifos per bed bug, respectively. Bed bugs were collected from infested homes in Denmark at ten locations and bred in the laboratory. The frequency of permethrin-resistant individuals was high in Danish bed bug populations as susceptible individuals were only found in three of ten populations. In contrast, the frequency of chlorpyrifos-resistant individuals was low in Danish bed bug populations, but resistant individuals were found in five of ten populations. To test the significance of the observed resistance, we performed tarsal contact test with commercially available insecticides. The test indicated that both a permethrin and a deltamethrin product had very low efficacy against the field-collected bed bug populations. Despite the reduced sensitivity to synthetic pyrethroids, all populations tested in the tarsal test on the commercial product with micro-encapsulated chlorpyrifos resulted in close to 100% mortality. Springer-Verlag, 2011 Kilpinen Ole Department of Integrated Pest Management, Aarhus University, Forsøgsvej 1, 4200, Slagelse, Denmark aut Kristensen Michael Department of Integrated Pest Management, Aarhus University, Forsøgsvej 1, 4200, Slagelse, Denmark aut Vagn Jensen Karl-Martin Department of Integrated Pest Management, Aarhus University, Forsøgsvej 1, 4200, Slagelse, Denmark aut Parasitology Research Springer-Verlag 109/5(2011-11-01), 1461-1464 0932-0113 109:5<1461 2011 109 436 https://doi.org/10.1007/s00436-011-2423-3 text/html Onlinezugriff via DOI 1 brief-communication jats NATIONALLICENCE 856 40 https://doi.org/10.1007/s00436-011-2423-3 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Kilpinen Ole Department of Integrated Pest Management, Aarhus University, Forsøgsvej 1, 4200, Slagelse, Denmark aut NATIONALLICENCE 700 1- Kristensen Michael Department of Integrated Pest Management, Aarhus University, Forsøgsvej 1, 4200, Slagelse, Denmark aut NATIONALLICENCE 700 1- Vagn Jensen Karl-Martin Department of Integrated Pest Management, Aarhus University, Forsøgsvej 1, 4200, Slagelse, Denmark aut NATIONALLICENCE 773 0- Parasitology Research Springer-Verlag 109/5(2011-11-01), 1461-1464 0932-0113 109:5<1461 2011 109 436 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer