Insecticide Susceptibility of Field-collected Blattellagermanica (Blattaria: Blattalidae) in Busan, Republic of Koreaduring 2014
2017
Jang, C.W., Korea Center for Disease Control and Prevention, Chungbuk, Republic of Korea | Ju, Y.R., Korea Center for Disease Control and Prevention, Chungbuk, Republic of Korea | Chang, K.S., Korea Center for Disease Control and Prevention, Chungbuk, Republic of Korea
The susceptibility values for field-collected (BG-BG) and laboratory (KS-BG) strainsof German cockroaches (BS-BG), Blattella germanica (L.) to five syntheticpyrethroid and three organophosphate insecticides were assessed by topicalapplication. Both KS-BG and BS-BG strains demonstrated the highest levels ofsusceptibility to deltamethrin with LD50values of 0.0035 μg/female and1.5744 μg/female, respectively. The KS-BG strain demonstrated the lowestsusceptibility level to fenthion with an LD50value of 0.0698 μg/female, while theBS-BG field population showed the lowest susceptibility to bifenthrin with4.6811 μg/female. The BS-BG field population showed resistance levels of 50 to640 fold higher against the eight pesticides evaluated compared to the KS-BG strain.The resistance ratios (RR) of the eight pesticides were compared using populations ofB. germanica that were collected from the same locality during 2007 and 2014. Thefield population of B. germanica collected during 2014 demonstrated significantlyhigh resistance to an organophosphates and all pyrethroids when compared withthose collected during 2007, but RR values were less than 10 except for chlorpyrifos-methyl and chlorpyrifos with RR values of 74 and 104, respectively.
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