Entomological Research (2009) 39, 243-247

Kyu-Sik Chang, Jin-Sung Jung, Chan Park, Hee-Il Lee, Wook-Gyo Lee, Dong-Kyu Lee and E-Hyun Shin (2009)
Insecticide susceptibility and resistance of Blattella germanica (Blattaria: Blattellidae) in Seoul, Republic of Korea, 2007
Entomological Research 39 (4), 243-247
Abstract: The susceptibility of Blattella germanica (L.) in the Republic of Korea (ROK) to insecticides was evaluated under laboratory conditions using 12 insecticides currently used by the local public health centers and/or pest control operators in the ROK. The insecticides included seven pyrethroids and five organophosphates. Based on their LD₅₀ values, the order of susceptibility of B. germanica adults to the insecticides was chlorpyrifos-methyl, profenofos and chlorpyrifos with values of 0.07, 0.29 and 0.88 µg/female, respectively. The least susceptibility was obtained with tetramethrin at LD₅₀ of 7.39 µg/female. In the comparative resistance test, the resistance ratios (RR) of 12 insecticides were compared to each other using field-collected B. germanica adults in Seoul between 1993 and 2007. Blattella germanica demonstrated higher RRs to pyrethroids such as lambda-cyhalothrin, and low RRs among the organophosphates. Among the pyrethroids, lambda-cyhalothrin had the highest RRs of 111- and 129-fold differences at LD₅₀ and LD₉₀ values, respectively. Among the organophosphates, profenofos was observed to have the highest RRs of 4- and 15-fold differences at LD₅₀ and LD₉₀ values, respectively. However, there were no significant differences in susceptibility to tetramethrin, chlorpyrifos and fenitrothion. Blattella germanica was more susceptible to pyridafenthion showing a 0.7-fold difference in a resistance ratio (RRLD₅₀= LD₅₀ value of 2007/LD₅₀ value of 1993). Resistance ratio of tetramethrin was low, but susceptibility was also not high.
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Link to article at publishers website
Database assignments for author(s): Dong Kyu Lee, Kyu-Sik Chang

Research topic(s) for pests/diseases/weeds:
control - general
pesticide resistance of pest

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Pest and/or beneficial records:

Beneficial	Pest/Disease/Weed	Crop/Product	Country	Quarant.
	Blattella germanica		Korea-South