Journal of Oil Palm Research Vol. 24  2012 April p.  1240-1249
DOI:

Dispersion of the bagworms Pteroma pendula and Metisa plana in oil palm

Author(s): HO Cheng Tuck * ; YUSOF Ibrahim ** ; KHOO Khay Chong *

An attempt was made to determine optimum sampling unit of between-palm and within-palm distribution of bagworms and their interspecific association distribution in oil palm using aggregation indices or distribution models. The within-frond distribution of bagworms varied significantly within the oil palm crown. Peak bagworm density was recorded between frond numbers 9 and 19. Through polynomial regression, standardised residual and relative net precision analyses, frond number 17 was established as the representative sampling unit for experimental work, and frond numbers 10-19 should be used when a greater precision is required as in life-table construction. A lack of interspecific association suggested these sampling units to be applicable for single and mixed infestations. Evaluation of between-palm dispersion revealed that Taylor’s Power Law gave a more appropriate fit with highly significant r2 values for all categories of assessment. The bagworms were regularly dispersed in oil palm with a general mean-variance relationship of log (s2) = 1.780 + 0.821 log (x¯).

Keywords: , , ,

Author Information
* CABI Southeast and East Asia Regional Centre, P.O. Box 210, 43400 Serdang,Selangor.Malaysia

**Faculty of Technical and Vocational Education, Universiti Pendidikan Sultan Idris,35900 Tanjong Malim,Perak,Malaysia.
E-mail:yusofib@yahoo.com


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