Bioactivity of Azadirachta Excelsa Jack. Extractives on Selected Insects

Azadirachta excelsa Jack. is a fast growing timber species that has been newly chosen as a potential forest plantation species to overcome timber deficit for domestic consumption in future. This species like Azadirachta indica is suspected to contain biologically active compounds that is detrime...

Full description

Saved in:

Bibliographic Details
Main Author:	T. Lardizabal, Maria Lourdes
Format:	Thesis
Language:	English English
Published:	1998
Subjects:	Azadirachta - Insects - Behavior - Case studies
Online Access:	http://psasir.upm.edu.my/id/eprint/9952/1/FH_1998_1_A.pdf
Tags:	Add Tag No Tags, Be the first to tag this record!

id	my-upm-ir.9952
record_format	uketd_dc
spelling	my-upm-ir.99522011-02-25T08:36:16Z Bioactivity of Azadirachta Excelsa Jack. Extractives on Selected Insects 1998 T. Lardizabal, Maria Lourdes Azadirachta excelsa Jack. is a fast growing timber species that has been newly chosen as a potential forest plantation species to overcome timber deficit for domestic consumption in future. This species like Azadirachta indica is suspected to contain biologically active compounds that is detrimental on insects. Many studies have been done on the A. indica, a relative species to A. excelsa, however, studies on A. excelsa are still in preliminary stages. Therefore, the aim of this study was to evaluate the effect of A.excelsa crude extractives towards three selected insect pests, (i.e. Spodoptera Iitura, Callosobruchus chinensis and Coptotermes curvignathus). A preliminary test to evaluate the susceptibility of A. excelsa wood towards termites, compared to Koompasia malaccensis, Hevea brasiliensis and Pinus caribaea was also conducted. In the first part of the study, the A.excelsa plant extracts were extracted from different plant parts (i.e. leaf, bark, trunk, twigs and branch) using a range of polar to non-polar solvents, namely hexane, petroleum ether, toluene, ethyl acetate and methanol. The plant extractives were sampled and analysed through Thin Layer Chromatography (TLC) and Infrared Spectrocopy (IR). In the second part of the study, bioassay tests were conducted on the selected insects. The insects were exposed to the plant extractives prepared at three concentration levels (i.e. 250 ppm, 500 ppm and 1000 ppm) and the solvents (0 ppm) as the control, by feeding the insects with treated food source. The S. litura larvae were fed with castor leaf discs soaked in the respective extractives. The C. chinensis adults were exposed to mungbean seeds that had been soaked in the plant extrctives while the C. curvignathus were fed with treated filter paper. In the last part of this study, the A. excelsa wood together with the other three wood species mentioned earlier, were exposed to the termites both in the laboratory and field. Azadirachta - Insects - Behavior - Case studies 1998 Thesis http://psasir.upm.edu.my/id/eprint/9952/ http://psasir.upm.edu.my/id/eprint/9952/1/FH_1998_1_A.pdf application/pdf en public masters Universiti Putra Malaysia Azadirachta - Insects - Behavior - Case studies Faculty of Forestry English
institution	Universiti Putra Malaysia
collection	PSAS Institutional Repository
language	English English
topic	Azadirachta - Insects - Behavior - Case studies
spellingShingle	Azadirachta - Insects - Behavior - Case studies T. Lardizabal, Maria Lourdes Bioactivity of Azadirachta Excelsa Jack. Extractives on Selected Insects
description	Azadirachta excelsa Jack. is a fast growing timber species that has been newly chosen as a potential forest plantation species to overcome timber deficit for domestic consumption in future. This species like Azadirachta indica is suspected to contain biologically active compounds that is detrimental on insects. Many studies have been done on the A. indica, a relative species to A. excelsa, however, studies on A. excelsa are still in preliminary stages. Therefore, the aim of this study was to evaluate the effect of A.excelsa crude extractives towards three selected insect pests, (i.e. Spodoptera Iitura, Callosobruchus chinensis and Coptotermes curvignathus). A preliminary test to evaluate the susceptibility of A. excelsa wood towards termites, compared to Koompasia malaccensis, Hevea brasiliensis and Pinus caribaea was also conducted. In the first part of the study, the A.excelsa plant extracts were extracted from different plant parts (i.e. leaf, bark, trunk, twigs and branch) using a range of polar to non-polar solvents, namely hexane, petroleum ether, toluene, ethyl acetate and methanol. The plant extractives were sampled and analysed through Thin Layer Chromatography (TLC) and Infrared Spectrocopy (IR). In the second part of the study, bioassay tests were conducted on the selected insects. The insects were exposed to the plant extractives prepared at three concentration levels (i.e. 250 ppm, 500 ppm and 1000 ppm) and the solvents (0 ppm) as the control, by feeding the insects with treated food source. The S. litura larvae were fed with castor leaf discs soaked in the respective extractives. The C. chinensis adults were exposed to mungbean seeds that had been soaked in the plant extrctives while the C. curvignathus were fed with treated filter paper. In the last part of this study, the A. excelsa wood together with the other three wood species mentioned earlier, were exposed to the termites both in the laboratory and field.
format	Thesis
qualification_level	Master's degree
author	T. Lardizabal, Maria Lourdes
author_facet	T. Lardizabal, Maria Lourdes
author_sort	T. Lardizabal, Maria Lourdes
title	Bioactivity of Azadirachta Excelsa Jack. Extractives on Selected Insects
title_short	Bioactivity of Azadirachta Excelsa Jack. Extractives on Selected Insects
title_full	Bioactivity of Azadirachta Excelsa Jack. Extractives on Selected Insects
title_fullStr	Bioactivity of Azadirachta Excelsa Jack. Extractives on Selected Insects
title_full_unstemmed	Bioactivity of Azadirachta Excelsa Jack. Extractives on Selected Insects
title_sort	bioactivity of azadirachta excelsa jack. extractives on selected insects
granting_institution	Universiti Putra Malaysia
granting_department	Faculty of Forestry
publishDate	1998
url	http://psasir.upm.edu.my/id/eprint/9952/1/FH_1998_1_A.pdf
_version_	1747811033104252928

Bioactivity of Azadirachta Excelsa Jack. Extractives on Selected Insects

Similar Items