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Previous issue date: 2017-03-31 / The exploitation potential of new biopesticides sources is very broad in Brazil and worldwide. In the past few years, the search for these products has been intensified due to serious health and environmental issues caused by the use of synthetic insecticides. In this context, essential oils and extracts of vegetal species have been considered as an alternative to agriculture. Thus, the aim of this work was to test the insecticidal potential of species belonging to the genus Lippia Lippia insignis Mondenk 1976, Lippia lasiocalycina Schauer, 1832 e Lippia thymoides Martius & Schauer, 1832 no controle de insetos-praga que provocam danos econ?micos (Callosobruchus maculatus Fabricius, 1775 e Nasutitermes corniger Motschulsky, 1855) in the control of insect-pest responsible for economic damage (Callosobruchus. maculatus and Nasutitermes corniger). The samples were collected in the experimental area in the Horto Florestal (UEFS) and after the material was dried, the essential oils were extracted and the extracts were prepared. In vitro trials were performed in order to verify the effects of essential oils and extracts against C. maculatus and N. corniger. The methodology of exposition to contaminated surface, testing an initial concentration of aqueous and methanolic extract and essential oils was adopted to determine the insecticidal activity of extracts and oils. The mortality was verified 24 and 48 hours after treatment application, and the product with major potential on the insect mortality was diluted in different concentrations to determine the medium lethal concentration (LC50). The repellent activity against C. maculatus and N. corniger was evaluated. Moreover, specific tests with C. maculatus investigated the product efficiency in two methods of application, as well as the quantification and identification of chemical constituents present in the studied species oils using GC/FID and GC/MS techniques. The results obtained revealed, occurrence highlighted of ?-mirceno and E -ocimenona in the sample of L. lasiocalycina, in L. insignis were prominent ?-mirceno e o limoneno. For L. thymoides the main constituents were: E-cariofileno e o ?xido de cariofileno.for C. maculatus, the essential oil of L. insignis stood out as insecticidal activity with CL50 of 3,11 ?l/ml. Although both methods of application showed efficiency in the control of this insect-pest, there was no repellent activity verified in the oil of L. insignis (5?l/ml). For N. corniger, the essential oils of all tested species, as well as the methanolic extract of L. insignis exhibited promising results in the control of this insect-pest. It was also verified that L. lasiocalycina possessed lower LC50 (0,47 ?l/ml) compared to L. insignis (0,88 ?l/ml) and L. thymoides (3,64 ?l/ml), while the LC50 of L. insignis methanolic extract was 27,84 mg/ml. Furthermore, essential oils and methanolic extracts of Lippia studied species revealed repellent activity in the N. corniger in vitro trials. / O potencial de explora??o de novas fontes de biopesticidas ? bastante amplo no Brasil e no mundo. Nos ?ltimos anos, a busca por esses produtos tem se intensificado em virtude dos graves problemas de sa?de e ambientais advindos do uso de inseticidas sint?ticos. Neste contexto, os ?leos essenciais e extratos de esp?cies vegetais tem se mostrado uma boa alternativa para a agricultura. Deste modo, o objetivo deste trabalho foi testar o potencial inseticida de esp?cies pertencentes ao g?nero Lippia (Lippia insignis Mondenk 1976, Lippia lasiocalycina Schauer, 1832 e Lippia thymoides Martius & Schauer, 1832 no controle de insetos-praga que provocam danos econ?micos (Callosobruchus maculatus Fabricius,1775 e Nasutitermes corniger Motschulsky, 1855). A coleta das plantas foi realizada na ?rea experimental do Horto Florestal da UEFS e o material coletado, ap?s a secagem, foi destinado a extra??o de ?leos essenciais e preparo dos extratos. Foram realizados ensaios in vitro para verifica??o dos efeitos dos ?leos essenciais e extratos contra C. maculatus e N. corniger. Para a determina??o inicial da atividade inseticida dos extratos e ?leos foi utilizada a metodologia de exposi??o ? superf?cie contaminada, testando-se uma concentra??o inicial do extrato aquoso, extrato metan?lico e ?leos essenciais. A mortalidade foi verificada 24 e 48 hs ap?s a aplica??o dos tratamentos. O produto com maior potencial sobre a mortalidade dos insetos testados foi dilu?do em diferentes concentra??es para determina??o da concentra??o letal mediana (CL50). A atividade repelente contra C. maculatus e N. corniger foi avaliada. Al?m disso, testes espec?ficos com C. maculatus investigaram a efici?ncia do produto em dois m?todos de aplica??o, bem como a quantifica??o e identifica??o de constituintes qu?micos presentes nos ?leos de esp?cies estudados utilizando t?cnicas GC/ FID e GC / MS. Os resultados demonstraram, a ocorr?ncia destacada do ?-mirceno e E-ocimenona nas amostras de L. lasiocalycina, em L. insignis destacaram-se, ?-mirceno e limoneno. Para L. thymoides os constituintes principais foram: E-cariofileno e o ?xido de cariofileno. Para C. maculatus, que o ?leo essencial da esp?cie L. insignis destacou-se quanto ? atividade inseticida com CL50 de 3,11 ?l/ml. Embora ambos os m?todos de aplica??o tenham se mostrado eficientes no controle deste inseto-praga, n?o foi verificada atividade repelente do ?leo de L. insignis (5?l/ml). Para N. corniger, os ?leos essenciais de todas as esp?cies testadas, al?m do extrato metan?lico da esp?cie L. insignis mostraram-se promissores no controle a este inseto-praga. Foi verificado que a esp?cie L. lasiocalycina apresentou menor CL50 (0,47 ?l/ml) comparada a L. insignis (0,88 ?l/ml) e L. thymoides (3,64 ?l/ml), j? o extrato metan?lico de L. insignis obteve CL50 de (27,84 mg/ml). Os ?leos essenciais e extrato metan?lico das esp?cies de Lippia estudadas demonstram atividade repelente a N. corniger nos ensaios in vitro.
| Identifer | oai:union.ndltd.org:IBICT/oai:tede2.uefs.br:8080:tede/503 |
| Date | 31 March 2017 |
| Creators | Santos, Daiane Rodrigues dos |
| Contributors | Oliveira , Lenaldo Muniz de |
| Publisher | Universidade Estadual de Feira de Santana, Mestrado Acad?mico em Recursos Gen?ticos Vegetais, UEFS, Brasil, DEPARTAMENTO DE CI?NCIAS BIOL?GICAS |
| Source Sets | IBICT Brazilian ETDs |
| Language | Portuguese |
| Detected Language | English |
| Type | info:eu-repo/semantics/publishedVersion, info:eu-repo/semantics/masterThesis |
| Format | application/pdf |
| Source | reponame:Biblioteca Digital de Teses e Dissertações da UEFS, instname:Universidade Estadual de Feira de Santana, instacron:UEFS |
| Rights | info:eu-repo/semantics/openAccess |
| Relation | 8146646481622241874, 600, 600, 600, 5026123383450589282, -3439178843068202161 |
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