Repellent
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 effects of leaf and seed hexane, ethyl acet...
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Online Access: | http://www.sciencedirect.com/science/article/pii/S1658077X13000398 |
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doaj-9072e0e1a05346afa523e55ceeb88e3b2020-11-25T00:20:58ZengElsevierJournal of the Saudi Society of Agricultural Sciences1658-077X2015-06-0114212813310.1016/j.jssas.2013.08.005RepellentMarimuthu GovindarajanMohan RajeswaryRajamohan SivakumarMosquito 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 effects of leaf and seed hexane, ethyl acetate, benzene, chloroform and methanol extract of Delonix elata on repellent activity against the malaria vector mosquito Anopheles stephensi (Diptera: Culicidae). Evaluation was carried out in a net cage (45 × 30 × 45 cm) containing 100 blood starved female mosquitoes of An. stephensi. Repellent activity was carried out in laboratory conditions. Plant crude extracts of D. elata were applied at 1.0, 2.5, and 5.0 mg/cm2 separately in the exposed forearm of volunteers. Ethanol was used as the sole control. Applied leaf and seed crude extracts were observed to protect against mosquito bites. There were no allergic reactions experienced by the volunteer subjects. The repellent activity of the extract was dependent on the strength of the extract. Among the tested solvents, both the leaf and seed methanol extracts showed maximum efficacy. The highest concentration of 5.0 mg/cm2 provided over 210 and 180 min protection for the leaf and seed extracts, respectively. Crude extracts of D. elata (leaf and seed) exhibit the potential for controlling An. stephensi.http://www.sciencedirect.com/science/article/pii/S1658077X13000398Repellent activityDelonix elataLeaf and seedMalarial vectorAnopheles stephensi |
collection |
DOAJ |
language |
English |
format |
Article |
sources |
DOAJ |
author |
Marimuthu Govindarajan Mohan Rajeswary Rajamohan Sivakumar |
spellingShingle |
Marimuthu Govindarajan Mohan Rajeswary Rajamohan Sivakumar Repellent Journal of the Saudi Society of Agricultural Sciences Repellent activity Delonix elata Leaf and seed Malarial vector Anopheles stephensi |
author_facet |
Marimuthu Govindarajan Mohan Rajeswary Rajamohan Sivakumar |
author_sort |
Marimuthu Govindarajan |
title |
Repellent |
title_short |
Repellent |
title_full |
Repellent |
title_fullStr |
Repellent |
title_full_unstemmed |
Repellent |
title_sort |
repellent |
publisher |
Elsevier |
series |
Journal of the Saudi Society of Agricultural Sciences |
issn |
1658-077X |
publishDate |
2015-06-01 |
description |
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 effects of leaf and seed hexane, ethyl acetate, benzene, chloroform and methanol extract of Delonix elata on repellent activity against the malaria vector mosquito Anopheles stephensi (Diptera: Culicidae). Evaluation was carried out in a net cage (45 × 30 × 45 cm) containing 100 blood starved female mosquitoes of An. stephensi. Repellent activity was carried out in laboratory conditions. Plant crude extracts of D. elata were applied at 1.0, 2.5, and 5.0 mg/cm2 separately in the exposed forearm of volunteers. Ethanol was used as the sole control. Applied leaf and seed crude extracts were observed to protect against mosquito bites. There were no allergic reactions experienced by the volunteer subjects. The repellent activity of the extract was dependent on the strength of the extract. Among the tested solvents, both the leaf and seed methanol extracts showed maximum efficacy. The highest concentration of 5.0 mg/cm2 provided over 210 and 180 min protection for the leaf and seed extracts, respectively. Crude extracts of D. elata (leaf and seed) exhibit the potential for controlling An. stephensi. |
topic |
Repellent activity Delonix elata Leaf and seed Malarial vector Anopheles stephensi |
url |
http://www.sciencedirect.com/science/article/pii/S1658077X13000398 |
work_keys_str_mv |
AT marimuthugovindarajan repellent AT mohanrajeswary repellent AT rajamohansivakumar repellent |
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1725364665543819264 |