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NISCAIR ONLINE PERIODICALS REPOSITORY (NOPR) >
NISCAIR PUBLICATIONS >
Research Journals >
Indian Journal of Natural Products and Resources (IJNPR)
[Formerly Natural Product Radiance (NPR)] >
NPR Vol.4 [2005] >
NPR Vol.4(6) [November-December 2005] >
| Title: | Effect of lamellarin alkaloid mixture obtained from marine Ascidian Didemnum obscurum and its synergistic action with Beauveria bassiana on Culex quinquefasciatus (Say) larvae |
| Authors: | Rao, M Srinivasa
Misra, Sunil
Murty, U Suryanarayana
Venkateswarlu, Y
Srinivasulu, M |
| Keywords: | Culex quinquefasciatus
esfenvalrate
Didemnum obscurum
Lamellarin alkaloids mixture
Beauveria bassiana |
| Issue Date: | Dec-2005 |
| Publisher: | CSIR |
| IPC Code: | Int. cl.7 — A61K 35/00, A01N 25/00 |
| Abstract: | A preliminary
laboratory trial was undertaken to determine the bioefficacy of lamellarin
alkaloid mixture (LMA), obtained from the Indian Ascidian, Didemnum
obscurum against II and III stage of Culex
quinquefasciatus (CQ) larvae. For
this study, Esfenvalrate (EFV) a synthetic pyrithroid was taken as positive
control. Both these compounds at different concentrations caused mortality of II
and III instar of CQ larvae between 48 to 96 hours. When compared the toxicity
efficacy of these compounds, EFV was shown to be more toxic than the LMA. From
the synergistic study, II and III instar larvae were exposed to LC50
of Beauveria bassiana (Bb) along with the lowest concentration of LMA
(1ppm) and EFV (0.05ppm), which
showed a significant increase in the morality rate within 48 hours. Between
these two compounds tested, EFV is a known neurotoxic agent and hence not
advisable to apply on mosquito control. As LMA is reported for its many
biologically important properties, it also showed larvicidal activity against CQ
larvae. From this study, it is concluded that synergistic action of B.
bassiana along with LMA can be utilized for mosquito control operations. The
detailed results are discussed in this paper.
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| Page(s): | 460-465 |
| ISSN: | 0975-1092 (Online); 0972-592X (Print) |
| Source: | NPR Vol.4(6) [November-December 2005]
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