Insecticide resistance profiles and possible underlying mechanisms in German cockroaches, Blattella germanica(Linnaeus)(Dictyoptera: Blattellidae) from Peninsular Malaysia

Abstract

Insecticide resistance profiles and possible underlying mechanisms in German cockroaches, Blattella germanica (Linnaeus) (Dictyoptera: Blattellidae) from Peninsular Malaysia Leng-ChoyLEEi)' 2) and Chow-Yang LEEi)･ 3)

Insecticide Resistance Profiles and Synergism in Field Populations of the German Cockroach (Dictyoptera: Blattellidae) From Singapore

“…Our Þndings are comparable with those of Lee et al (1996a) and Lee and Lee (2004), who reported that propoxur resistance in the majority of German cockroach strains from Peninsular Malaysia was primarily due to elevated P450 monooxygenases and esterases. Lee and Lee (2004) also reported that altered acetylcholinesterase was involved in propoxur resistance in several Þeld strains of German cockroach from Peninsular Malaysia, as the resistance levels were only partially suppressed with PBO and DEF.…”

“…Previously, Scharf et al (1999) demonstrated that overexpression of P450 monooxygenases was well correlated with chlorpyrifos resistance in B. germanica. The involvement of microsomal oxidases and hydrolases in chlorpyrifos resistance also has been documented in several strains of German cockroach (Siegfried and Scott 1992, Hemingway et al 1993, Lee and Lee 2004. A more detailed synergism study on chlorpyrifos resistance is warranted to further substantiate the current observation.…”

“…Lee and Lee (2004) also reported that altered acetylcholinesterase was involved in propoxur resistance in several Þeld strains of German cockroach from Peninsular Malaysia, as the resistance levels were only partially suppressed with PBO and DEF. In this study, the administration of PBO ϩ DEF along with propoxur led to complete mortality in all of the Þeld strains tested (except for 98% in the B1 Tampines Central population) (Table 8).…”

“…The resistance ratio was classiÞed into the following Þve categories according to Lee and Lee (2004): Յ1, absence of resistance; Ͼ1 to Յ5, low resistance; Ͼ5 to Յ10, moderate resistance; Ͼ10 to Յ50, high resistance; and Ͼ50, very high resistance. Synergism Studies.…”

Status dan perkembangan resistensi Aedes aegypti (Linnaeus) (Diptera: Culicidae) strain Bandung, Bogor, Makassar, Palu, dan VCRU terhadap insektisida permetrin dengan seleksi lima generasi

“…Bila mengacu kepada pengelompokan rasio resistensi yang disusun oleh Lee & Lee (2004), maka semua strain yang diperoleh dari lapangan termasuk pada kategori resisten tinggi (nilai RR 50 > 10). Tingginya tingkat resistensi terhadap permetrin kemungkinan disebabkan karena permetrin telah digunakan secara luas sejak tahun 1980an, baik untuk pengendalian hama pertanian, Terjadinya peningkatan resistensi akibat seleksi dari waktu ke waktu sampai pada lima generasi hingga 17,8 kali nampaknya karena insektisida telah menyeleksi individu rentan, dan yang berhasil hidup adalah individu yang resisten terhadap insektisida.…”