The use of Eucalyptus tereticornis Sm. (Myrtaceae) oil (leaf extract) as a natural larvicidal agent against the malaria vector Anopheles stephensi Liston (Diptera: Culicidae).
Secondary metabolites obtained from the indigenous plants with proven mosquito control potential can be used as an alternative to synthetic insecticides under the integrated vector control. The essential oil extract from the forest redgum, Eucalyptus tereticornis Sm. (Myrtaceae) was tested against mature and immature mosquito vector Anopheles stephensi Liston (Diptera) under laboratory condition. The extract showed strong larvicidal, pupicidal and adulticidal activity. The leaf oil extracts showed high bioactivity at high doses. Results obtained from the laboratory experiment showed that the leaf extracts suppressed the pupal and adult activity of Anopheles stephensi at higher doses. In general, first and second instar larvae were more susceptible to all treatments. Clear dose -response relationships were established with the highest dose of 160ppm plant extract evoking almost 100% mortality. The results obtained suggest that, in addition to their medicinal activities, E. tereticornis can also serve as a natural mosquitocide.
Senthil Nathan
Sengottayan
S
Post Graduate and Research Department of Biotechnology, Vivekanandha College (W), Trichengode, Namakkal, Tamil Nadu 637 205, India. senthilkalaidr@hotmail.com
D000818:Animals; D000852:Anopheles / Q000145:classification / Q000187:drug effects*; D004305:Dose-Response Relationship, Drug; D005052:Eucalyptus; D007303:Insect Vectors / Q000187:drug effects*; D007814:Larva / Q000187:drug effects; D009032:Mosquito Control / Q000379:methods*; D010936:Plant Extracts / Q000506:poisoning* / Q000633:toxicity; D018515:Plant Leaves / Q000737:chemistry; D010938:Plant Oils / Q000737:chemistry
D010936:Plant Extracts; D010938:Plant Oils