Potential insecticide extracts isolated from cestrum parqui l' herit (solanaceae) for controlling of hylurgus ligniperda (fabricius).
Fecha
2021Autor
Quiroz Cortez, Andrés
UNIVERSIDAD DE LA FRONTERA
Institución
Resumen
The increasing international trade in forest and wood products forests are increasingly being affected for the introduction of exotic wood-boring beetles. Among it most important species present in Chile is found golden-haired bark-beetle, H. ligniperda (Coleoptera: Curculionidae). It was first detected in the mid 1980s and can be present throughut region with P. radiata plantations. Currently, the invasive exotic species cost millions of euros every year from all exporting countries. To cope with these problems the forestry industry has used widely methyl bromide pesticide for the fumigation of forest product export. On the other hand, international environmental organism has banned its use for the next decade becaue it is considered an ozone-depleting substance. Hence, research to find controlling alternative treatments are urgently needed prioritizing the use of safe systems. One auspicious strategy for insect pest control is the use of feeding deterrent compounds due that this may act on the gustatory receptors inhibiting the consumption of food by herbivorous.
The focus of the thesis was study pesticidal activity of C. parqui extracts obtained with different polarities of solvents. The thesis is composed of four parts:
In Chapter I, detail a review of the literature related on H. ligniperda, antifeedants substances and pesticidal activity of C. parqui leaves for finish with hypothesis and general and specific objectives of the Thesis.
In Chapter II of the thesis is related in the obtention the chloroform, ethyl acetate and n-butanol extracts (saponic extract) from C. parqui leaves and then evaluate the extracts on the feeding behavior of H. ligniperda adults, and 5th and 6th instar larvae.
In Chapter III detail the analysis and identification of the active sub-fractions from chloroform fraction obtained from C. parqui leaves ethanol extracts using chromatography techniques. The identification of active sub-fraction from C. parqui was obtained through antifeedant assays on H. ligniperda.
In Chapter IV. Finally, the general conclusions of the work and the future perspective are presented.