Dispersion pattern and sampling of Diaphorina citri Kuwayama (Hemiptera:Psylidae) populations on Citrus suhuiensis hort. ex tanaka in Padang Ipoh Terengganu, Malaysia
An understanding of the dispersion patterns of a pest is an important pre-requisite for developing an effective pest management program. In this study, fifty five (55) citrus trees were surveyed for adult Diaphorina citri once every four week for a period of ten months (March 2011 – December 2011)...
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| Format: | Article |
| Language: | English |
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Universiti Putra Malaysia Press
2012
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| Online Access: | http://psasir.upm.edu.my/id/eprint/19206/ http://psasir.upm.edu.my/id/eprint/19206/1/79.%20Dispersion%20Pattern%20and%20Sampling%20of%20Diaphorina%20citri%20Kuwayama.pdf |
| _version_ | 1848843664688676864 |
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| author | Sule, Hassan Muhamad, Rita Omar, Dzolkhifli Hee, Alvin Kah Wei Chik, Zazali |
| author_facet | Sule, Hassan Muhamad, Rita Omar, Dzolkhifli Hee, Alvin Kah Wei Chik, Zazali |
| author_sort | Sule, Hassan |
| building | UPM Institutional Repository |
| collection | Online Access |
| description | An understanding of the dispersion patterns of a pest is an important pre-requisite for developing an effective pest management program. In this study, fifty five (55) citrus trees were surveyed for adult Diaphorina citri once every four week for a period of ten months (March 2011 – December 2011). Analysis of spatial-distribution pattern using various indices of dispersion and regression models showed that D. citri exhibited an aggregated distribution on Citrus suhuiensis. Taylor’s power law ( a = 0.897, b = 1.267, R2 = 0.74) fitted the data better than Iwoa’s regression modal (a = 0.376, ß = 0.196, R2 = 0.409). The optimal sample sizes needed for fixed precision levels of 0.10, 0.15 and 0.25 were estimated using Taylor’s regression coefficients, and the required sample sizes increased dramatically with increased levels of precision. Therefore, these sampling-plan presented should serve as a tool for an efficient estimation of D. citri population density in citrus orchard for pest management decision. |
| first_indexed | 2025-11-15T08:18:38Z |
| format | Article |
| id | upm-19206 |
| institution | Universiti Putra Malaysia |
| institution_category | Local University |
| language | English |
| last_indexed | 2025-11-15T08:18:38Z |
| publishDate | 2012 |
| publisher | Universiti Putra Malaysia Press |
| recordtype | eprints |
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| spelling | upm-192062015-11-24T05:57:03Z http://psasir.upm.edu.my/id/eprint/19206/ Dispersion pattern and sampling of Diaphorina citri Kuwayama (Hemiptera:Psylidae) populations on Citrus suhuiensis hort. ex tanaka in Padang Ipoh Terengganu, Malaysia Sule, Hassan Muhamad, Rita Omar, Dzolkhifli Hee, Alvin Kah Wei Chik, Zazali An understanding of the dispersion patterns of a pest is an important pre-requisite for developing an effective pest management program. In this study, fifty five (55) citrus trees were surveyed for adult Diaphorina citri once every four week for a period of ten months (March 2011 – December 2011). Analysis of spatial-distribution pattern using various indices of dispersion and regression models showed that D. citri exhibited an aggregated distribution on Citrus suhuiensis. Taylor’s power law ( a = 0.897, b = 1.267, R2 = 0.74) fitted the data better than Iwoa’s regression modal (a = 0.376, ß = 0.196, R2 = 0.409). The optimal sample sizes needed for fixed precision levels of 0.10, 0.15 and 0.25 were estimated using Taylor’s regression coefficients, and the required sample sizes increased dramatically with increased levels of precision. Therefore, these sampling-plan presented should serve as a tool for an efficient estimation of D. citri population density in citrus orchard for pest management decision. Universiti Putra Malaysia Press 2012 Article PeerReviewed application/pdf en http://psasir.upm.edu.my/id/eprint/19206/1/79.%20Dispersion%20Pattern%20and%20Sampling%20of%20Diaphorina%20citri%20Kuwayama.pdf Sule, Hassan and Muhamad, Rita and Omar, Dzolkhifli and Hee, Alvin Kah Wei and Chik, Zazali (2012) Dispersion pattern and sampling of Diaphorina citri Kuwayama (Hemiptera:Psylidae) populations on Citrus suhuiensis hort. ex tanaka in Padang Ipoh Terengganu, Malaysia. Pertanika Journal of Tropical Agricultural Science, 35 (S). pp. 25-36. ISSN 1511-3701; ESSN: 2231-8542 http://www.pertanika.upm.edu.my/Pertanika%20PAPERS/JTAS%20Vol.%2035%20(S)%20Dec.%202012/03_page%2025-36.pdf |
| spellingShingle | Sule, Hassan Muhamad, Rita Omar, Dzolkhifli Hee, Alvin Kah Wei Chik, Zazali Dispersion pattern and sampling of Diaphorina citri Kuwayama (Hemiptera:Psylidae) populations on Citrus suhuiensis hort. ex tanaka in Padang Ipoh Terengganu, Malaysia |
| title | Dispersion pattern and sampling of Diaphorina citri Kuwayama (Hemiptera:Psylidae) populations on Citrus suhuiensis hort. ex tanaka in Padang Ipoh Terengganu, Malaysia |
| title_full | Dispersion pattern and sampling of Diaphorina citri Kuwayama (Hemiptera:Psylidae) populations on Citrus suhuiensis hort. ex tanaka in Padang Ipoh Terengganu, Malaysia |
| title_fullStr | Dispersion pattern and sampling of Diaphorina citri Kuwayama (Hemiptera:Psylidae) populations on Citrus suhuiensis hort. ex tanaka in Padang Ipoh Terengganu, Malaysia |
| title_full_unstemmed | Dispersion pattern and sampling of Diaphorina citri Kuwayama (Hemiptera:Psylidae) populations on Citrus suhuiensis hort. ex tanaka in Padang Ipoh Terengganu, Malaysia |
| title_short | Dispersion pattern and sampling of Diaphorina citri Kuwayama (Hemiptera:Psylidae) populations on Citrus suhuiensis hort. ex tanaka in Padang Ipoh Terengganu, Malaysia |
| title_sort | dispersion pattern and sampling of diaphorina citri kuwayama (hemiptera:psylidae) populations on citrus suhuiensis hort. ex tanaka in padang ipoh terengganu, malaysia |
| url | http://psasir.upm.edu.my/id/eprint/19206/ http://psasir.upm.edu.my/id/eprint/19206/ http://psasir.upm.edu.my/id/eprint/19206/1/79.%20Dispersion%20Pattern%20and%20Sampling%20of%20Diaphorina%20citri%20Kuwayama.pdf |