Elango G, Rahuman AA, Kamaraj C, Zahir AA, Bagavan A.
Unit of Bioactive Natural Products, Post Graduate and Research
Department of Zoology, C. Abdul Hakeem College, Melvisharam, 632 509,
Vellore District, Tamil Nadu, India.
Abstract
Mosquito control is facing a threat because of the emergence of
resistance to synthetic insecticides. Insecticides of botanical origin
may serve as suitable alternative biocontrol techniques in the future.
The purpose of the present study was to assess the effect of leaf
ethyl acetate, acetone and methanol extracts of Aegle marmelos (L.)
Correa ex Roxb (Rutaceae), Andrographis lineata Wallich ex Nees.
(Acanthaceae), Andrographis paniculata (Burm.f.) Wall. ex Nees.
(Acanthaceae), Cocculus hirsutus (L.) Diels (Menispermaceae), Eclipta
prostrata L. (Asteraceae) and Tagetes erecta L. (Compositae) on
ovicidal and oviposition-deterrent activities against Culex
tritaeniorhynchus Giles (Diptera: Culicidae). The percentage of egg
hatching in methanol extracts of Andrographis lineata, Cocculus
hirsutus and T. erecta were 16, 12 and 16 exerted at 500 ppm,
respectively. The percentage of effective oviposition repellency was
97.77 at 500 ppm and the lowest repellency was 42.06 at 31.25 ppm in
methanol and acetone extracts of Andrographis lineata and Andrographis
paniculata, 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 suggest that the leaf solvent plant
extracts have the potential to be used as an ideal ecofriendly
approach for the control of the Culex tritaeniorhynchus.
PMID: 20372924 [PubMed - as supplied by publisher]
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