Spatial and temporal epidemiology of basal stem rot in oil palm (Elaeis guineensis) in Tawau Region, Sabah

Intense oil palm monoculture has resulted pathogenic diseases, pests and physiological disorders, especially basal stem rot. The BSR disease was believed caused by Ganoderma boninense (fungal pathogen). The actual mechanisms of infection was ambiguous, even though controls and treatments of BSR dise...

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Main Author:	Wong, Wan Chew
Format:	Thesis
Language:	English English
Published:	2008
Subjects:	SB1-1110 Plant culture
Online Access:	https://eprints.ums.edu.my/id/eprint/41697/1/24%20PAGES.pdf https://eprints.ums.edu.my/id/eprint/41697/2/FULLTEXT.pdf
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id	my-ums-ep.41697
record_format	uketd_dc
spelling	my-ums-ep.416972024-11-29T03:57:56Z Spatial and temporal epidemiology of basal stem rot in oil palm (Elaeis guineensis) in Tawau Region, Sabah 2008 Wong, Wan Chew SB1-1110 Plant culture Intense oil palm monoculture has resulted pathogenic diseases, pests and physiological disorders, especially basal stem rot. The BSR disease was believed caused by Ganoderma boninense (fungal pathogen). The actual mechanisms of infection was ambiguous, even though controls and treatments of BSR disease only aimed to prolonging productivity life of oil palm. The objectives of present study were to determine the relationship between the incidences of external visible disease symptoms (recorded by visual census) and subclinical symptoms (detected by GSM test) with soil properties. The study site located in Tawau region, state of Sabah. It was situated in a flat landscape with three different of soil type namely Inanam series, lumisir and Paliu with 9x9x9 m in planting density. Sampling design was divided into four main parts included mapping disease incidence, visual census assessment on oil palms, Ganoderma infection detection employed with Ganoderma selective medium technique (GSM), and soil sampling. In this present study, GSM test has been demonstrated that 8.5 % of total palms were infected, however they still appeared healthy. In addition, semi-variogram analysis revealed infected palms had a short distance of spatial dependency to their surrounding palms (1 to 2 palms) and small-scale spread of an agent might be occurred. The possible agents might be air-borne spores through human, insect and animals or spread via root-to-root contact. At topsoil layer, subclinical symptoms were positive correlated with soil pH, coarse sand and fine sand whereas negative correlated with organic C, clay, slit, AI, available P, total P, total N, Ca, Mg, K and CEC. 2008 Thesis https://eprints.ums.edu.my/id/eprint/41697/ https://eprints.ums.edu.my/id/eprint/41697/1/24%20PAGES.pdf text en public https://eprints.ums.edu.my/id/eprint/41697/2/FULLTEXT.pdf text en validuser masters Universiti Malaysia Sabah School of Science and Technology
institution	Universiti Malaysia Sabah
collection	UMS Institutional Repository
language	English English
topic	SB1-1110 Plant culture
spellingShingle	SB1-1110 Plant culture Wong, Wan Chew Spatial and temporal epidemiology of basal stem rot in oil palm (Elaeis guineensis) in Tawau Region, Sabah
description	Intense oil palm monoculture has resulted pathogenic diseases, pests and physiological disorders, especially basal stem rot. The BSR disease was believed caused by Ganoderma boninense (fungal pathogen). The actual mechanisms of infection was ambiguous, even though controls and treatments of BSR disease only aimed to prolonging productivity life of oil palm. The objectives of present study were to determine the relationship between the incidences of external visible disease symptoms (recorded by visual census) and subclinical symptoms (detected by GSM test) with soil properties. The study site located in Tawau region, state of Sabah. It was situated in a flat landscape with three different of soil type namely Inanam series, lumisir and Paliu with 9x9x9 m in planting density. Sampling design was divided into four main parts included mapping disease incidence, visual census assessment on oil palms, Ganoderma infection detection employed with Ganoderma selective medium technique (GSM), and soil sampling. In this present study, GSM test has been demonstrated that 8.5 % of total palms were infected, however they still appeared healthy. In addition, semi-variogram analysis revealed infected palms had a short distance of spatial dependency to their surrounding palms (1 to 2 palms) and small-scale spread of an agent might be occurred. The possible agents might be air-borne spores through human, insect and animals or spread via root-to-root contact. At topsoil layer, subclinical symptoms were positive correlated with soil pH, coarse sand and fine sand whereas negative correlated with organic C, clay, slit, AI, available P, total P, total N, Ca, Mg, K and CEC.
format	Thesis
qualification_level	Master's degree
author	Wong, Wan Chew
author_facet	Wong, Wan Chew
author_sort	Wong, Wan Chew
title	Spatial and temporal epidemiology of basal stem rot in oil palm (Elaeis guineensis) in Tawau Region, Sabah
title_short	Spatial and temporal epidemiology of basal stem rot in oil palm (Elaeis guineensis) in Tawau Region, Sabah
title_full	Spatial and temporal epidemiology of basal stem rot in oil palm (Elaeis guineensis) in Tawau Region, Sabah
title_fullStr	Spatial and temporal epidemiology of basal stem rot in oil palm (Elaeis guineensis) in Tawau Region, Sabah
title_full_unstemmed	Spatial and temporal epidemiology of basal stem rot in oil palm (Elaeis guineensis) in Tawau Region, Sabah
title_sort	spatial and temporal epidemiology of basal stem rot in oil palm (elaeis guineensis) in tawau region, sabah
granting_institution	Universiti Malaysia Sabah
granting_department	School of Science and Technology
publishDate	2008
url	https://eprints.ums.edu.my/id/eprint/41697/1/24%20PAGES.pdf https://eprints.ums.edu.my/id/eprint/41697/2/FULLTEXT.pdf
_version_	1818611424838025216

Spatial and temporal epidemiology of basal stem rot in oil palm (Elaeis guineensis) in Tawau Region, Sabah

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