Larvicidal activity of Ageratum houstonianum Mill. (Asteraceae) leaf extracts against Anopheles stephensi, Aedes aegypti and Culex quinquefasciatus (Diptera: Culicidae)

Larvicidal Activity of Silver Nanoparticles Synthesized Using Extracts ofAmbrosia arborescens(Asteraceae) to ControlAedes aegyptiL. (Diptera: Culicidae)

“…For example, Govindarajan and Karuppannan [44] used the methanolic extract of Eclipta alba against third instar larvae, obtaining a LC 50 of 127.64 ppm.Álvarez et al [45] reported that the LC 50 of the ethereal extracts of Heli oppositifolia and Jaegeria hirta are 41 ppm and 24 ppm, respectively. Sukhthankar et al [46] used a methanolic extract of the leaves of Chromolaena odorata, obtaining a LC 50 of 138 ppm, and Tennyson et al [47] tested hexane and ethyl acetate extracts of Ageratum houstonianum, obtaining LC 50 values of 8889.13 ppm and 1952.12 ppm, respectively. Furthermore, and as far as we are aware, only two previous reports exist regarding the toxicity of plants within the Ambrosia genus against mosquito larvae: (a) Eisa [48] tested the aqueous extract of A. marítima leaves against field-collected Culex larvae, obtaining a LC 50 of 1349 ppm, and (b) De La Torre et al [49] tested the ethereal extract made with the aerial parts of A. confertifolia against Ae.…”

Larvicidal and Growth Inhibitory Activities of Ageratum houstonianum (Mill, 1768) Against the Dengue Vector Aedes aegypti (Linnaeus, 1762)

“…aegypti and Cx. quinquefasciatus were described by Tennyson et al (2015a). Our studies showed that the A. houstonianum leaf acetone extract was more effective in comparison to these studies.…”

“…Insecticidal properties (Bowers et al, 1976;Ravindran, Samuel, Alex, & William, 2012) and insecticidal compounds (Renuga & Sahayaraj, 2009) including precocenes were reported in this plant (Kumar, 2014). The crude extract of A. houstonianum had shown the mosquitocidal properties (Boussaada et al, 2008;Sakthivadivel & Daniel, 2008;Pavela, 2009;Senthilkumar, Varma, & Gurusubramanian, 2009;Elango et al, 2010) including adulticidal (Ravindran et al, 2012), larvicidal (Tennyson, Ravindran, Eapen, & William, 2015a), ovicidal (Tennyson, Ravindran, Eapen, & William, 2015b); the extract also showed repellent (Tennyson, Ravindran, Eapen, & William, 2012a) and oviposition deterrent activities (Tennyson, Ravindran, Eapen, & William, 2012b). The phytochemical composition of A. houstonianum showed the presence of chromenes, precocene I and II, which have been described for their anti-JH activity (Haunerland & Bowers, 1985;Binder, Bowers, & Evans, 1991;Lu et al, 2014).…”

“…Most of the studies on A. houstonianum were focused on cidal activity and lethal effects on mosquitoes (Sharma et al, 2006;Arivoli & Tennyson, 2011;Tennyson et al, 2015a). However, the biological activities of acetone extract of A. houstonianum have not been specified against Ae.…”