Sampling technique for determining cocoa pod borer (Conopormorpha cramerella) (Snellen) (Lepidoptera: gracillariidae) and cocoa pod phenology

An in-depth investigation on sampling of cocoa pod bore (CPB) was carried out over a 12 month period in 2000 at Malaysia Cocoa Board Research station at Hilir Perak, Sg Sumur Perak conducted over a period of 12 months. Several components were examined. The components examined were the most reliab...

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Main Author:	Mohd Ali, Noorazlin
Format:	Thesis
Language:	English English
Published:	2005
Subjects:	Caco pod borer Lepidoptera
Online Access:	http://psasir.upm.edu.my/id/eprint/8529/1/FS_2005_48_IR.pdf
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id	my-upm-ir.8529
record_format	uketd_dc
spelling	my-upm-ir.85292023-12-04T03:30:09Z Sampling technique for determining cocoa pod borer (Conopormorpha cramerella) (Snellen) (Lepidoptera: gracillariidae) and cocoa pod phenology 2005-06 Mohd Ali, Noorazlin An in-depth investigation on sampling of cocoa pod bore (CPB) was carried out over a 12 month period in 2000 at Malaysia Cocoa Board Research station at Hilir Perak, Sg Sumur Perak conducted over a period of 12 months. Several components were examined. The components examined were the most reliable and efficient sampling technique, determining distribution of CPB with respect to pod phenology, determining optimum sample size to produce sampling parameters for CPB. Generally, during low population levels, the mean population densities and their relative variations were similar for all sampling techniques. However, during high population densities, mean densities and relative variations increased. This is especially for random sampling which has been found as the most reliable sampling technique. Using two aggregation models which are widely used; Taylor's Power Law (b coefficient) CPB's egg were found to be highly aggregated. In detennining optimum sample sizes, two parameters were calculated; b of Green's model and β for Kuno's model. The Green model was suitable to produce the most efficient sampling sizes during low and high population densities. During high population densities, random sampling was the most reliable with Taylor's Power Law providing the optimum coefficients for developing optimum sample sizes. Caco pod borer Lepidoptera 2005-06 Thesis http://psasir.upm.edu.my/id/eprint/8529/ http://psasir.upm.edu.my/id/eprint/8529/1/FS_2005_48_IR.pdf text en public masters Universiti Putra Malaysia Caco pod borer Lepidoptera Faculty of Science Syed Hassan, Syed Tajuddin English
institution	Universiti Putra Malaysia
collection	PSAS Institutional Repository
language	English English
advisor	Syed Hassan, Syed Tajuddin
topic	Caco pod borer Lepidoptera
spellingShingle	Caco pod borer Lepidoptera Mohd Ali, Noorazlin Sampling technique for determining cocoa pod borer (Conopormorpha cramerella) (Snellen) (Lepidoptera: gracillariidae) and cocoa pod phenology
description	An in-depth investigation on sampling of cocoa pod bore (CPB) was carried out over a 12 month period in 2000 at Malaysia Cocoa Board Research station at Hilir Perak, Sg Sumur Perak conducted over a period of 12 months. Several components were examined. The components examined were the most reliable and efficient sampling technique, determining distribution of CPB with respect to pod phenology, determining optimum sample size to produce sampling parameters for CPB. Generally, during low population levels, the mean population densities and their relative variations were similar for all sampling techniques. However, during high population densities, mean densities and relative variations increased. This is especially for random sampling which has been found as the most reliable sampling technique. Using two aggregation models which are widely used; Taylor's Power Law (b coefficient) CPB's egg were found to be highly aggregated. In detennining optimum sample sizes, two parameters were calculated; b of Green's model and β for Kuno's model. The Green model was suitable to produce the most efficient sampling sizes during low and high population densities. During high population densities, random sampling was the most reliable with Taylor's Power Law providing the optimum coefficients for developing optimum sample sizes.
format	Thesis
qualification_level	Master's degree
author	Mohd Ali, Noorazlin
author_facet	Mohd Ali, Noorazlin
author_sort	Mohd Ali, Noorazlin
title	Sampling technique for determining cocoa pod borer (Conopormorpha cramerella) (Snellen) (Lepidoptera: gracillariidae) and cocoa pod phenology
title_short	Sampling technique for determining cocoa pod borer (Conopormorpha cramerella) (Snellen) (Lepidoptera: gracillariidae) and cocoa pod phenology
title_full	Sampling technique for determining cocoa pod borer (Conopormorpha cramerella) (Snellen) (Lepidoptera: gracillariidae) and cocoa pod phenology
title_fullStr	Sampling technique for determining cocoa pod borer (Conopormorpha cramerella) (Snellen) (Lepidoptera: gracillariidae) and cocoa pod phenology
title_full_unstemmed	Sampling technique for determining cocoa pod borer (Conopormorpha cramerella) (Snellen) (Lepidoptera: gracillariidae) and cocoa pod phenology
title_sort	sampling technique for determining cocoa pod borer (conopormorpha cramerella) (snellen) (lepidoptera: gracillariidae) and cocoa pod phenology
granting_institution	Universiti Putra Malaysia
granting_department	Faculty of Science
publishDate	2005
url	http://psasir.upm.edu.my/id/eprint/8529/1/FS_2005_48_IR.pdf
_version_	1794018763364892672

Sampling technique for determining cocoa pod borer (Conopormorpha cramerella) (Snellen) (Lepidoptera: gracillariidae) and cocoa pod phenology

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