Efeitos de extratos de Casearia javitensis Kunth (Salicaceae) sobre Sitophilus zeamais Motschulsky (Coleoptera, Curculionidae)
Over millions of years of action of natural selection, certain plant characteristics were improved and resulted in plant species with different levels of susceptibility to attack by herbivorous insects. These characteristics are expressed in different ways, among these, plants can produce substan...
| Autor principal: | Barbosa, Ernesto Augusto Silva |
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| Grau: | Dissertação |
| Idioma: | por |
| Publicado em: |
Instituto Nacional de Pesquisas da Amazônia - INPA
2020
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| Assuntos: | |
| Acesso em linha: |
https://repositorio.inpa.gov.br/handle/1/12385 http://lattes.cnpq.br/4305204133083705 |
| Resumo: |
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Over millions of years of action of natural selection, certain plant characteristics were
improved and resulted in plant species with different levels of susceptibility to attack
by herbivorous insects. These characteristics are expressed in different ways, among
these, plants can produce substances with insecticidal properties. There may be
about two thousand plants which have their uses in the control of organisms harmful
to agriculture. The use of plant extracts in storage environments aims to decrease in
all stages of development of individuals in the population causing damage. The
objective of this study was to evaluate insecticidal activity of organic and aqueous
extracts of Casearia javitensis in different concentrations on Sitophilus zeamais in
laboratory conditions. The extracts used in the bioassays were concentrated on rotaevaporator
(organic extracts) and freeze dryer apparatus (aqueous extracts). In this
work, we used six types of C. javitensis extracts that have been tested under two
types of exposure, totaling 12 bioassays. The data were analyzed by means of
multiple linear regression comparison test. The most promising extracts were
aqueous extracts of leaves and branches, both in contact bioassays; and
dichloromethanic extracts branches in intake bioassays. Among dichloromethanic
extracts, concentration more effectively in control of S. zeamais is 10.4 mg / ml
extract branches applied through ingestion of contaminated grains, registered
mortality of 52%. |