Variable intensity sampling: developing operational plans for the green rice leafhopper in wet paddy ecosystem in Malaysia
A relatively new sampling scheme called the variable intensity sampling (VIS) has been proposed for a rice pest, the green leafhopper (GLH),Nephotettix spp. Taylor’s Power Law (TPL) coefficients a and b were used in developing the VIS plan. Population density estimations and decision making attribut...
| Main Authors: | , , , , |
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| Format: | Article |
| Language: | English |
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Malaysian Agricultural Research and Development Institute (MARDI)
1998
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| Online Access: | http://psasir.upm.edu.my/id/eprint/48908/1/Variable%20intensity%20sampling%20developing%20operational%20plans%20for%20the%20green%20rice%20leafhopper%20in%20wet%20paddy%20ecosystem%20in%20Malaysia.pdf |
| _version_ | 1825930097492754432 |
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| author | Mohd Rashid, Mansor Syed Hassan, Syed Tajuddin Ismail, Azhar Alwi, Ahmad Hussein, Mohd Yusof |
| author_facet | Mohd Rashid, Mansor Syed Hassan, Syed Tajuddin Ismail, Azhar Alwi, Ahmad Hussein, Mohd Yusof |
| author_sort | Mohd Rashid, Mansor |
| collection | UPM |
| description | A relatively new sampling scheme called the variable intensity sampling (VIS) has been proposed for a rice pest, the green leafhopper (GLH),Nephotettix spp. Taylor’s Power Law (TPL) coefficients a and b were used in developing the VIS plan. Population density estimations and decision making attributes were derived from data obtained from four experimental plots at Universiti Putra Malaysia for a sampling period of 73 days. Four sampling occasions were chosen for analysis. The data fit well the TPL and are represented as lns2 = 0.24 + 1.30lnx– (s2 = variance, x– = mean density). A precision level of 0.25 and an economic threshold of 2 hoppers/hill were selected in developing this plan. The average sample number required in VIS ranged from 13 to 48. The VIS-TABLE for sampling and the VIS-CHART for determining the required sample size for GLH are presented. |
| first_indexed | 2024-03-06T09:06:26Z |
| format | Article |
| id | upm.eprints-48908 |
| institution | Universiti Putra Malaysia |
| language | English |
| last_indexed | 2024-03-06T09:06:26Z |
| publishDate | 1998 |
| publisher | Malaysian Agricultural Research and Development Institute (MARDI) |
| record_format | dspace |
| spelling | upm.eprints-489082016-12-29T09:55:42Z http://psasir.upm.edu.my/id/eprint/48908/ Variable intensity sampling: developing operational plans for the green rice leafhopper in wet paddy ecosystem in Malaysia Mohd Rashid, Mansor Syed Hassan, Syed Tajuddin Ismail, Azhar Alwi, Ahmad Hussein, Mohd Yusof A relatively new sampling scheme called the variable intensity sampling (VIS) has been proposed for a rice pest, the green leafhopper (GLH),Nephotettix spp. Taylor’s Power Law (TPL) coefficients a and b were used in developing the VIS plan. Population density estimations and decision making attributes were derived from data obtained from four experimental plots at Universiti Putra Malaysia for a sampling period of 73 days. Four sampling occasions were chosen for analysis. The data fit well the TPL and are represented as lns2 = 0.24 + 1.30lnx– (s2 = variance, x– = mean density). A precision level of 0.25 and an economic threshold of 2 hoppers/hill were selected in developing this plan. The average sample number required in VIS ranged from 13 to 48. The VIS-TABLE for sampling and the VIS-CHART for determining the required sample size for GLH are presented. Malaysian Agricultural Research and Development Institute (MARDI) 1998 Article PeerReviewed application/pdf en http://psasir.upm.edu.my/id/eprint/48908/1/Variable%20intensity%20sampling%20developing%20operational%20plans%20for%20the%20green%20rice%20leafhopper%20in%20wet%20paddy%20ecosystem%20in%20Malaysia.pdf Mohd Rashid, Mansor and Syed Hassan, Syed Tajuddin and Ismail, Azhar and Alwi, Ahmad and Hussein, Mohd Yusof (1998) Variable intensity sampling: developing operational plans for the green rice leafhopper in wet paddy ecosystem in Malaysia. Journal of Tropical Agriculture and Food Science, 26 (1). pp. 41-50. ISSN 1394-9829; ESSN: 2289-9650 http://ejtafs.mardi.gov.my/index.php/publication/issues/archive/92-1998/volume-26-no1/639-260113 |
| spellingShingle | Mohd Rashid, Mansor Syed Hassan, Syed Tajuddin Ismail, Azhar Alwi, Ahmad Hussein, Mohd Yusof Variable intensity sampling: developing operational plans for the green rice leafhopper in wet paddy ecosystem in Malaysia |
| title | Variable intensity sampling: developing operational plans for the green rice leafhopper in wet paddy ecosystem in Malaysia |
| title_full | Variable intensity sampling: developing operational plans for the green rice leafhopper in wet paddy ecosystem in Malaysia |
| title_fullStr | Variable intensity sampling: developing operational plans for the green rice leafhopper in wet paddy ecosystem in Malaysia |
| title_full_unstemmed | Variable intensity sampling: developing operational plans for the green rice leafhopper in wet paddy ecosystem in Malaysia |
| title_short | Variable intensity sampling: developing operational plans for the green rice leafhopper in wet paddy ecosystem in Malaysia |
| title_sort | variable intensity sampling developing operational plans for the green rice leafhopper in wet paddy ecosystem in malaysia |
| url | http://psasir.upm.edu.my/id/eprint/48908/1/Variable%20intensity%20sampling%20developing%20operational%20plans%20for%20the%20green%20rice%20leafhopper%20in%20wet%20paddy%20ecosystem%20in%20Malaysia.pdf |
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