Seleksi Resistensi Plutella xylostella terhadap Deltametrin = Selection toward Resistance to Deltamethrin in Plutella xylostella

ABSTRACT Population of Plutella xylostella (Lepidoptera: Plutellidae), that had resistant to deltamethrin (Kopeng population, Central Jawa), was selected in laboratorium. This population divided into two sub population: non selected (KNS) and selected (KS). Second intar of KS population were selected each generation to caisim leave that deeped with deltamethrin (100 ppm) for 96 hours. The survival larve were replaced to the fresh leave to continue their development time. The susceptible population of P. xylostella, collected from Selo, Boyolali were used for comparison. After seven generation of selection the resistace ratio of KS-F9 increased 7 times compared to non selection population (KNS-F9), and 51 times compared to susceptible population (Selo-F2). KNS population that not selected did not decrease the resistant level. The resistant population of P. xylsotella could be used for research associated with resistant management. Keywords: selection â resistance â Plutella xylostella deltametri