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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| Format: | Thesis |
| Language: | English English |
| Published: |
2005
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| Subjects: | |
| Online Access: | http://psasir.upm.edu.my/id/eprint/8529/ http://psasir.upm.edu.my/id/eprint/8529/1/FS_2005_48_IR.pdf |
| _version_ | 1848840896022315008 |
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| author | Mohd Ali, Noorazlin |
| author_facet | Mohd Ali, Noorazlin |
| author_sort | Mohd Ali, Noorazlin |
| building | UPM Institutional Repository |
| collection | Online Access |
| 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. |
| first_indexed | 2025-11-15T07:34:37Z |
| format | Thesis |
| id | upm-8529 |
| institution | Universiti Putra Malaysia |
| institution_category | Local University |
| language | English English |
| last_indexed | 2025-11-15T07:34:37Z |
| publishDate | 2005 |
| recordtype | eprints |
| repository_type | Digital Repository |
| spelling | upm-85292023-12-04T03:30:09Z http://psasir.upm.edu.my/id/eprint/8529/ Sampling technique for determining cocoa pod borer (Conopormorpha cramerella) (Snellen) (Lepidoptera: gracillariidae) and cocoa pod phenology 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. 2005-06 Thesis NonPeerReviewed text en http://psasir.upm.edu.my/id/eprint/8529/1/FS_2005_48_IR.pdf Mohd Ali, Noorazlin (2005) Sampling technique for determining cocoa pod borer (Conopormorpha cramerella) (Snellen) (Lepidoptera: gracillariidae) and cocoa pod phenology. Masters thesis, Universiti Putra Malaysia. Caco pod borer Lepidoptera English |
| spellingShingle | Caco pod borer Lepidoptera Mohd Ali, Noorazlin Sampling technique for determining cocoa pod borer (Conopormorpha cramerella) (Snellen) (Lepidoptera: gracillariidae) and cocoa pod phenology |
| title | 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_short | 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 |
| topic | Caco pod borer Lepidoptera |
| url | http://psasir.upm.edu.my/id/eprint/8529/ http://psasir.upm.edu.my/id/eprint/8529/1/FS_2005_48_IR.pdf |