Population density of Elaeidobius kamerunicus faust in different spikelet position at anthesising male inflorescence of Elaeis guineensis Jacq. in Sabah and Sarawak Malaysia

Siti Nurulhidayah Ahmad, . and Muhammad Nurul Yaqin Syarif, . and Mohamed Mazmira Mohd Masri, . and Hung King Jie, . and Saharul Abillah Mohamad, . and Norman Kamarudin, . Population density of Elaeidobius kamerunicus faust in different spikelet position at anthesising male inflorescence of Elaeis guineensis Jacq. in Sabah and Sarawak Malaysia. pp. 21-36. ISSN 1511-2780

The oil palm male inflorescences provide food source and breeding sites for the pollinating weevil Elaeidobius kamerunicus (E. kamerunicus). The present study examined the difference in the formation of the oil palm male inflorescences on different soil types and how the differences affect the population density of E. kamerunicus. Samplings of adult E. kamerunicus and the spikelets of fully-anthesising oil palm male inflorescences were conducted monthly for a period of 18 months at four oil palm plantations on peat and mineral soils in East Malaysia. Elaeidobius kamerunicus population density in peat soil areas was found to be lower than those in mineral soils (P0.05). It was also found that the male inflorescences spikelet length in the study sites on peat soil areas were less uniform; spikelets on the upper part of the inflorescence were significantly shorter ( 12.80 cm) compared to the spikelets sampled from the bottom part of the inflorescence ( 14.91 cm P 0.05 P 0.000-0.031). In addition compared to the lower part of the inflorescence significantly fewer weevils were found lodged on the spikelets sampled from the upper part of the inflorescence (Site 1´´ 8 adult weevils per spikelet; Site 2´´ 12 adult weevils per spikelet; Site 1´� 18 adult weevils per spikelet; Site 2´� 17 adult weevils per spikelet). However no significant correlation was found between the length of the spikelet and the weevil density on each spikelet (r 0.021- 0.181). The result from this study demonstrates the influence of the types on the formation of the inflorescence which requires further investigation.

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Abstract

The oil palm male inflorescences provide food source and breeding sites for the pollinating weevil Elaeidobius kamerunicus (E. kamerunicus). The present study examined the difference in the formation of the oil palm male inflorescences on different soil types and how the differences affect the population density of E. kamerunicus. Samplings of adult E. kamerunicus and the spikelets of fully-anthesising oil palm male inflorescences were conducted monthly for a period of 18 months at four oil palm plantations on peat and mineral soils in East Malaysia. Elaeidobius kamerunicus population density in peat soil areas was found to be lower than those in mineral soils (P0.05). It was also found that the male inflorescences spikelet length in the study sites on peat soil areas were less uniform; spikelets on the upper part of the inflorescence were significantly shorter ( 12.80 cm) compared to the spikelets sampled from the bottom part of the inflorescence ( 14.91 cm P 0.05 P 0.000-0.031). In addition compared to the lower part of the inflorescence significantly fewer weevils were found lodged on the spikelets sampled from the upper part of the inflorescence (Site 1´´ 8 adult weevils per spikelet; Site 2´´ 12 adult weevils per spikelet; Site 1´� 18 adult weevils per spikelet; Site 2´� 17 adult weevils per spikelet). However no significant correlation was found between the length of the spikelet and the weevil density on each spikelet (r 0.021- 0.181). The result from this study demonstrates the influence of the types on the formation of the inflorescence which requires further investigation.

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Item Type:	Article
AGROVOC Term:	Elaeidobius kamerunicus
AGROVOC Term:	Elaeis guineensis
AGROVOC Term:	Oil palm
AGROVOC Term:	Sampling
AGROVOC Term:	Statistical analysis
AGROVOC Term:	Experimental design
AGROVOC Term:	Soil physical properties
AGROVOC Term:	Peat soils
AGROVOC Term:	Mineral soils
AGROVOC Term:	Sabah
Depositing User:	Mr. AFANDI ABDUL MALEK
Last Modified:	24 Apr 2025 00:55
URI:	http://webagris.upm.edu.my/id/eprint/9806

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