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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...

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Main Authors: Mohd Rashid, Mansor, Syed Hassan, Syed Tajuddin, Ismail, Azhar, Alwi, Ahmad, Hussein, Mohd Yusof
Format: Article
Language:English
Published: Malaysian Agricultural Research and Development Institute (MARDI) 1998
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
http://psasir.upm.edu.my/id/eprint/48908/
http://ejtafs.mardi.gov.my/index.php/publication/issues/archive/92-1998/volume-26-no1/639-260113
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spelling my.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
institution Universiti Putra Malaysia
building UPM Library
collection Institutional Repository
continent Asia
country Malaysia
content_provider Universiti Putra Malaysia
content_source UPM Institutional Repository
url_provider http://psasir.upm.edu.my/
language English
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.
format Article
author Mohd Rashid, Mansor
Syed Hassan, Syed Tajuddin
Ismail, Azhar
Alwi, Ahmad
Hussein, Mohd Yusof
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
author_facet Mohd Rashid, Mansor
Syed Hassan, Syed Tajuddin
Ismail, Azhar
Alwi, Ahmad
Hussein, Mohd Yusof
author_sort Mohd Rashid, Mansor
title 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_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_sort variable intensity sampling: developing operational plans for the green rice leafhopper in wet paddy ecosystem in malaysia
publisher Malaysian Agricultural Research and Development Institute (MARDI)
publishDate 1998
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
http://psasir.upm.edu.my/id/eprint/48908/
http://ejtafs.mardi.gov.my/index.php/publication/issues/archive/92-1998/volume-26-no1/639-260113
_version_ 1643834312855912448
score 13.211869

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