Determination of the Insect Repellent Activity of Herbs on Sitophillus Oryzae

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dc.contributor.authorSAJITHTHA, B.
dc.date.accessioned2021-11-08T05:47:24Z
dc.date.available2021-11-08T05:47:24Z
dc.date.issued2017
dc.description.abstractNatural products from plants are known as secondary metabolites. These compounds show several biological properties including insecticides activity. Storage losses in paddy alone have been estimated to be 4-6% and it had been estimated that 80% of this loss is due to insect attack. Based on, this research mainly focused on to protect the rice from Sitophilus oryzae by using herbal plant extraction. In Sri Lanka, only a limited number of studies have assessed the insecticides properties of herbs. Therefore, in this study, insecticides activities of selected three herbs species and their cytotoxicity were tested. Samples were collected from near to university premises. Using methanol extraction, herbs was extracted from three species,Cinnamomum cassia, Plectralthus amboinicus, and Aglaia roxburghiana . plant extract were tested for their insecticidal activities against adults of Sitophilus oryzae, using direct contact application. Responses varied with plant material, insect species, and exposure time. Testing was carried out for different concentrations of extracts (153.06 fig/cm2, 458.18 tg/cm2 and765.30). Insecticidal activity and best plant were discovered for Sitophilus oryzae . Methanol extracts of all plans showed insecticidal activity against tested insects. Best plant/s and part/s is leaf of Cinnamomum cassia, and least insecticidal activity shows Plectralthus amboinicus leaf. Toxicity assay was done to test the toxicity of plants. Artemia salina was used for toxicity assay. The results from toxicity assay, a leaf of Aglaia roxburghiana is having the high toxic and leaf of Plectralthus amboinicus is having the lest toxic. The results from this study confirm insecticidal activity in Aglaia roxburghiana, Plectralthus amboinicus and Cinnamomwn cassia. Further research is needed to identify the individual compounds responsible for insecticidal activity, which may in turn lead to developing natural insecticides from locally available herbs. Key words: Insecticidal activity, cytotoxicity and secondary metabolites.en_US
dc.identifier.otherUWU/SCT/12/0040
dc.identifier.urihttp://www.erepo.lib.uwu.ac.lk/bitstream/handle/123456789/7567/SCT%2012%20040-25102021155448.pdf?sequence=1&isAllowed=y
dc.language.isoenen_US
dc.publisherUva Wellassa University of Sri Lankaen_US
dc.relation.ispartofseries;UWU/SCT/12/0040
dc.subjectScience and Technology Degree Programme (SCT)en_US
dc.titleDetermination of the Insect Repellent Activity of Herbs on Sitophillus Oryzaeen_US
dc.title.alternativeResearch Article – SCT 2017en_US
dc.typeThesisen_US
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