Parasitology Research

, 106:481

Efficacy of botanical extracts against Japanese encephalitis vector, Culex tritaeniorhynchus

  • Gandhi Elango
  • Abdul Abdul Rahuman
  • Asokan Bagavan
  • Chinnaperumal Kamaraj
  • Abdul Abduz Zahir
  • Govindasamy Rajakumar
  • Sampath Marimuthu
  • Thirunavukkarasu Santhoshkumar
Original Paper


The purpose of the present study was to assess the effect of leaf hexane and chloroform extracts of Aegle marmelos, Andrographis lineata, Andrographis paniculata, Cocculus hirsutus, Eclipta prostrata, and Tagetes erecta on repellent, ovicidal, and oviposition-deterrent activities against Culex tritaeniorhynchus Giles (Diptera: Culicidae). The repellent action of the plant extracts tested varied depending on the plant species, part, solvent used in extraction, and the extract dose. The hexane extract of A. paniculata was more effective in exhibiting the repellent action against the mosquito as compared with A. lineata extract. Complete protections for 150 min were found in hexane extract of A. paniculata at 500 ppm against mosquito bites. Mean percent hatchability of the ovicidal activity was observed 24 h after treatment. The percent hatchability was inversely proportional to the concentration of extract and directly proportional to the eggs. No hatchability was observed with hexane, and chloroform extracts of A. lineata, A. paniculata, and hexane extract of T. erecta were exerted at 1,000 ppm. The percentage of effective oviposition repellency were 95.90, 94.75, 95.04, 90.58, 87.93, 87.14, 94.82, 95.71, 92.26, 90.58, 83.35, and 78.16 at 500 ppm, and the lowest repellency was 69.93, 53.06, 64.81, 70.06, 51.82, 54.54, 48.31, 66.71, 68.82, 61.85, 34.84, and 39.53 at 31.25 ppm in hexane and chloroform extracts of A. marmelos, A. lineata, A. paniculata, C. hirsutus, E. prostrata, and T. erecta, respectively. The oviposition activity index values revealed that the solvent plant extracts have deterrent effect, and they caused a remarkable negative response resulting in oviposition of very few eggs. These results clearly reveal that the hexane extracts of A. marmelos and A. paniculata served as a potential repellent, ovicidal, and oviposition deterrent against Japanese encephalitis vector, C. tritaeniorhynchus.


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Copyright information

© Springer-Verlag 2009

Authors and Affiliations

  • Gandhi Elango
    • 1
  • Abdul Abdul Rahuman
    • 1
  • Asokan Bagavan
    • 1
  • Chinnaperumal Kamaraj
    • 1
  • Abdul Abduz Zahir
    • 1
  • Govindasamy Rajakumar
    • 1
  • Sampath Marimuthu
    • 1
  • Thirunavukkarasu Santhoshkumar
    • 1
  1. 1.Unit of Bioactive Natural Products, Post Graduate and Research Department of ZoologyC. Abdul Hakeem CollegeVellore DistrictIndia

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