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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
https://eprints.ums.edu.my/id/eprint/41697/
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spelling my.ums.eprints.416972024-11-29T03:57:56Z https://eprints.ums.edu.my/id/eprint/41697/ Spatial and temporal epidemiology of basal stem rot in oil palm (Elaeis guineensis) in Tawau Region, Sabah 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 NonPeerReviewed text en https://eprints.ums.edu.my/id/eprint/41697/1/24%20PAGES.pdf text en https://eprints.ums.edu.my/id/eprint/41697/2/FULLTEXT.pdf Wong, Wan Chew (2008) Spatial and temporal epidemiology of basal stem rot in oil palm (Elaeis guineensis) in Tawau Region, Sabah. Masters thesis, Universiti Malaysia Sabah.
institution Universiti Malaysia Sabah
building UMS Library
collection Institutional Repository
continent Asia
country Malaysia
content_provider Universiti Malaysia Sabah
content_source UMS Institutional Repository
url_provider http://eprints.ums.edu.my/
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
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
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
https://eprints.ums.edu.my/id/eprint/41697/
_version_ 1817843841585119232
score 13.22586

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