Evaluation of larvicidal activity of the leaf extract of a weed plant, Ageratina adenophora , against two important species of mosquitoes, Aedes aegypti and Culex quinquefasciatus

AFRICAN JOURNAL OF BIOTECHNOLOGY (Impact Factor: 0.57). 03/2007; 6(5).
Source: OAI


An attempt is made in the present study to analyse the larvicidal effect of the leaf extract of a vastly grown (in the hilly regions of the Nilgiris district) weed plant, Ageratina adenophora on two important mosquito species, Aedes aegypti and Culex quinquefasciatus. The larval mortality of fourth instar larvae of A. aegypti and C. quinquefasciatus after 24 h of treatment were observed separately in control, 50, 100, 150, 200, 250, 300, 350, 400, 450 and 500 ppm concentrations of the leaf extract (acetone) of κA. adenophora. Based on the Probit analysis, the 24 h Lc50 value of the leaf extract of A. adenophora was found to be 356.70 ppm for A. aegypti and 227.20 ppm for C. quinquefasciatus. When compared to neem, the leaf extract of A. adenophora is more toxic to both A. aegypti and C. quin-quefasciatus and could be effectively used for the control of mosquito larvae.

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    • "In some parts of the world the use of these conventional chemicals has resulted in development of resistance(Patil et al., 2010, Mohan and Ramaswamy, 2007), affecting non targeted species some of which are beneficial insects (Park et al., 2012) and raised environmental and human health concerns(Scholte et al., 2003). "
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    ABSTRACT: Larvicidal activity of crude petroleum ether (PE), ethyl acetate (EtOAc) and methanol (MeOH) extracts of leaves and stem barks of Sterculiaquinqueloba (Garcke) K. Schum were testedagainst the late 3rd instar larvae of Anopheles gambiae, Aedesaegypti and Culexquinquefasciatusat 5 different concentrations50 – 800μg/ml. The larval mortality was observed after 24h, 48h and 72h of exposure. At 24h of exposure all extracts showed moderate larvicidal effects, except for methanolic extracts which showed very week effect at LC50>750μg/ml.The highest larvicidal activityrecorded for leaf extracts against each species used were LC5027.61μg/ml(EtOAc extracts), LC50 43.9μg/ml(PE extracts) and LC50 68.2μg/ml(EtOAc extracts) for A. gambiae, C. quinquefasciatus and A. aegypti respectively. Only EtOAc extract of stem against A. gambiae gave LC50range between 50 - 100μg/ml. Generally leaf extracts showed higher activity than stem extract. This is an ideal eco-friendly approach aid for the control of mosquito species A. gambiae, A. aegypti and C. quinquefasciatus.
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    • "Present scenario on the avoidance of breeding sites and synthetic insecticidal applications to combat with various forms such as larval and adult mosquito, have resulted in development of resistance without eliminating the risk of dengue outbreak [4] [5] . Thus, this has necessitated the exploration of natural products for the control of vector insects in general and mosquitoes in particular [6] [7] [8] [9] . "
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    ABSTRACT: Objective: To determine the phytochemical analysis and larvicidal activity of Trgia involucrata leaf extracts against fourth instar larvae of Aedes aegypti. Methods: Phytochemical analysis of hexane leaf extract and larvicidal activity was determined against two vector mosquito species at concentrations of 50, 100, 150, 200 and 250 ppm. Larval mortality was assessed after 24 hours. Results: The hexane extracts of Trgia involucrata was found to be higher mortality against the larvae of Aedes aegypti with a LC50 value of 153.51 ppm. Conclusions: These results suggested that the leaf extracts of Trgia involucrata showed potential to be used as an ideal ecofriendly approach for the control of the Aedes aegypti.
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    • "[7] [8] [9] It is also known for its insect control properties. [10] [11] [12] [13] [14] Solvent concentrate of leaves and flowers are mainly consisted with sesquiterpenoid derivatives. [15] [16] [17] [18] [19] Despite some sporadic attempts on insecticidal activity of E. adenophorum extracts, less attention has been focused on fungicidal activity. "
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    ABSTRACT: Bioactive constituents of Eupatorium adenophorum were investigated for antifungal activity. A structure-antifungal activity relationship of cadinene sesquiterpenes was predicted by evaluating individual derivatives. Cadinene derivatives were extracted from leaves of Eupatorium adenophorum using ethyl acetate. Five cadinene sesquiterpenes were isolated by column chromatography and Preparative Thin Layer Chromatography. Bioactivity of these cadinene sesquiterpenes were evaluated in vitro against four phytopathogenic fungi using poison food technique. Purified sesquiterpenes were spectroscopically elucidated as cadinan-3-ene-2,7-dione (1), 7-hydroxycadinan-3-ene-2-one (2), 5,6-dihydroxycadinan-3-ene-2,7-dione (3), cadinan-3,6-diene-2,7-dione (4) and 2-acetyl-cadinan-3,6-diene-7-one (5). Antifungal evaluation of these compounds against pathogenic fungi was found to be selective. Compound 1 was highly inhibitory towards S. rolfsii (ED 181.60 ± 0.58 μgmL) and R. solani (ED 189.74 ± 1.03 μgmL). Availability of plant material and significant antifungal activity makes the plant a potential source of antifungal agent and that can be exploited for the development of a natural fungicide.
    Journal of Environmental Science and Health Part B Pesticides Food Contaminants and Agricultural Wastes 06/2013; 48(6):516-22. DOI:10.1080/03601234.2013.761921 · 1.20 Impact Factor
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