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Articles by Resti Rahayu
Total Records ( 3 ) for Resti Rahayu
  Resti Rahayu , Intan Ahmad , Endang Sri Ratna , Marselina I. Tan and Nova Hariani
  Six strains of German cockroach, Blattella germanica, collected from three major cities in Indonesia which are Jakarta, Bandung and Surabaya were bio-assayed with topical application to monitor insecticide resistance to insecticides propoxur, permethrin and fipronil. In general, compared with VCRU susceptible strain as the standard, all cockroach strains were resistant to all insecticides tested, with Resistance Ratios ranging from 2.11-1013.17 fold. Majority of strains exhibited very high resistance (RR50>50) to permethrin; this study also revealed the existence of extremely high resistance to permethrin (RR50 of 1013.17 fold) in HHB-JKT strain. Resistance levels to both propoxur and fipronil is vary (RR50 ranging from 2.11-44.72 fold). But, in general, the field strains are still susceptible to fipronil. This study is the second report of German cockroach resistance to insecticides in Indonesia which suggest the importance of continued monitoring of insecticides susceptibility for controlling the German cockroach, B. germanica. In addition, the findings can be used in formulating potential strategies for cockroach resistance management.
  Resti Rahayu , Mairawita and Robby Jannatan
  Background and Objective: The German cockroach (Blattella germanica) is a well-known urban insect pest that has become resistant to synthetic insecticides. Hence, the alternative potent insecticides, synthesized from natural substances such as lemongrass essential oil are urgently needed. Its main objective was to experimentally test the efficacy and residual activity of lemongrass essential oil (Cymbopogon flexuosus) against German cockroache’s population. Materials and Methods: This study was conducted at the Research Laboratory of Animal Physiology, Department of Biology, Andalas University, Indonesia. It used lemongrass essential oil with different concentrations through Contact Toxicity Test (3.15 mg cm2), Fumigation Toxicity Test (1 g cm3) and Repellency Test (0.16 mg cm2). Results: Lemongrass essential oil was effective in killing German cockroaches through Contact Toxicity Test (LT90<24 h), lemongrass essential oil at sub-lethal concentration behaved as repellent to German cockroaches with 100% repellency values, observed effectively for 48 h of trial. Conclusion: Lemongrass essential oil is potential to be an alternative insecticide in controlling the resistance of German cockroaches through contact and repellency applications.
  Resti Rahayu , Annisa Darmis and Robby Jannatan
  Background and Objective: Papaya leaves have the potency to be developed as alternative insecticide to control the German cockroaches that have been resistant to synthetic insecticides. This study aimed to determine the potency of ethanolic extract of papaya leaf as toxicant and repellent against 2 populations of German cockroaches which are known resistant to synthetic insecticide. Materials and Methods: The methods that used was contact toxicity test and repellency test. The ethanolic extract of papaya leaf residues were used in contact toxicity test of 4 residues and a sub-lethal residue in repellency test. Three populations of German cockroach were collected in field and kept in laboratory. Results: Lethal residue 50% (LR50) of ethanolic extract of papaya leaf between 2.97-4.72 mg cm2 while lethal residue 90% (LR90) between 6.05-8.92 mg cm2 and very effective killed all population of German cockroach. Repellency value of ethanolic extract of papaya leaf with a sub-lethal residue of 0.39 mg cm2 between 88.89 -94.74% and level of repellency was very repellent. Conclusion: Ethanolic extract of papaya leaf could be formulated as a potent natural insecticide to control populations of German cockroach that have been resistant to synthetic insecticides.
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