Elango G, Rahuman AA, Zahir AA, Kamaraj C, Bagavan A, Rajakumar G,
Jayaseelan C, Santhoshkumar T, Marimuthu S.
Unit of Nanotechnology and Bioactive Natural Products, Post Graduate
and Research Department of Zoology, C. Abdul Hakeem College,
Melvisharam, 632 509, Vellore District, Tamil Nadu, India.
In recent times, there were considerable efforts made to promote the
use of environmentally friendly and biodegradable natural insecticides
and repellents, particularly from botanical sources. The present study
explored the effects of crude leaf ethyl acetate, acetone, and
methanol extracts of Aegle marmelos (L.) Correa ex Roxb, Andrographis
lineata Wallich ex Nees., Andrographis paniculata (Burm.f.) Wallich ex
Nees., Cocculus hirsutus (L.) Diels, Eclipta prostrata L., and Tagetes
erecta L. on repellent activity against Culex tritaeniorhynchus Giles.
The maximum repellent activity was observed at 500 ppm in methanol
extracts of A. marmelos, ethyl acetate extracts of A. lineata, C.
hirsutus, and E. prostrata and the mean complete protection time
ranged from 120 to 150 min with the different extracts tested. The
ethyl acetate extract of A. lineata showed 100% repellency in 120 min;
acetone extracts of A. marmelos and C. hirsutus and methanol extract
of T. erecta showed complete protection in 90 min at 250 ppm,
respectively. These results suggest that the leaf extracts of A.
marmelos, A. lineata, and C. hirsutus have the potential to be used as
an ideal eco-friendly approach for the control of the C.
tritaeniorhynchus. Therefore, this study provides first report on the
repellent activity against Japanese encephalitis, C. tritaeniorhynchus
of plant extracts from Southern India.
PMID: 20480375 [PubMed - as supplied by publisher]
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