Monitoring for insecticide resistance in field-collected populations of Blattella germanica (Blattaria: Blattellidae)
2010
Chang, K.S., Korea Center for Disease Control and Prevention, Seoul, Republic of Korea | Shin, E.H., Korea Center for Disease Control and Prevention, Seoul, Republic of Korea | Jung, J.S., Korea Center for Disease Control and Prevention, Seoul, Republic of Korea | Park, C., Korea Center for Disease Control and Prevention, Seoul, Republic of Korea | Ahn, Y.J., Seoul National University, Seoul, Republic of Korea
Seven field-collected populations of German cockroach, Blattella germanica (L.) (ICN, DNH, CHN, DGU, BSN, GSN, and GWJ), were tested for susceptibility to eight different insecticides by a topical application method, and were compared to an insecticide-susceptible KSS strain. Marked regional variations of insecticide susceptibility were observed. Extremely high to high levels of resistance were observed in bifenthrin [resistance ratio (RR), 46-159], deltamethrin (RR, 61-160), and esfenvalerate [RR, 70-270; except for BSN females (RR, 20) and GSN females (RR, 24)]. Low to moderate levels of resistance were observed in cypermethrin [RR, 16-29; except for DGU females (RR, 88) and BSN females (RR, 41)], permethrin [RR, 11-39; except for DNH females (RR, 110) and BSN females (RR, 44)], chlorpyrifos [RR, 2-13; except for GSN and GWJ females (RR, ca. 140)], chlorpyrifos-methyl (RR, 2-8), and fenthion (RR, 8-17). All of the colonies were susceptible to one or more of the insecticides examined. These results indicate that careful selection and rotational use of these insecticides should result in continued satisfactory control against field populations of German cockroach.
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