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International Journal of Tropical Insect Science

, Volume 24, Issue 3, pp 255–259 | Cite as

Preliminary observations on a field population of the oil palm-pollinating weevil Elaeidobius kamerunicus in Benin City, Nigeria

  • C. I. AisagbonhiEmail author
  • Norman Kamarudin
  • C. O. Okwuagwu
  • Mohd Basri Wahid
  • Trevor Jackson
  • V. Adaigbe
Short Communication

Abstract

Anthesizing male inflorescences of oil palms were randomly sampled for the oil palm-pollinating weevil Elaeidobius kamerunicus at the Nigerian Institute for Oil Palm Research (NIFOR) (field 56) in Benin City, Nigeria from March to September 2002. The weevils were counted and later examined for nematodes. There were no significant differences in the mean number of adult weevils sampled from various positions on the inflorescences, but there were significant differences in their mean numbers sampled on the various dates (P = 0.001). Microscopic examination of adult weevils indicated that nematodes are associated with the weevils and the spikelets. This preliminary survey indicates that E. kamerunicus is a major insect pollinator of the oil palm in NIFOR oil palm plantations. Its association with parasitic nematodes may have a bearing on the weevil’s pollination efficiency. These findings will help in understanding further the factors that govern pollination efficiency, percent fruit set and the occurrence of seasonal peaks in yields of fresh fruit from Nigerian oil palms.

Key words

oil palm pollination Elaeidobius kamerunicus nematodes Nigeria 

Mots clés

palmier à huile Elaeidobius kamerunicus pollinisation nématodes Nigeria 

Résumé

Un échantillonnage au hasard du charançon pollinisateur Elaeidobius kamerunicu a été réalisé dans les inflorescences mâles de palmier à huile à l’Institut Nigérian de recherche sur le palmier à huile, à Benin City, au Nigéria de mars à septembre 2002. Les charançons ont été dénombrés puis disséqués pour la recherche de nématodes parasites. Le nombre moyen de charançons adultes échantillonnés ne varie pas selon la partie de fleurs échantillonnées mais il varie selon la date (P = 0.001). L’examen microscopique des adultes révèlent que les nématodes sont associés aux charançons et aux bractées. Cette étude préliminaire montre qu’E. kamerunicus est le plus important insecte pollinisateur du palmier à huile dans les plantations de palmier de la NIFOR. Son association avec les nématodes parasites doit avoir une relation avec son efficacité de pollinisation. Ces résultats devraient permettre de mieux comprendre les facteurs impliqués dans l’efficacité de la pollinisation, le pourcentage de régimes et les pics saisonniers de production de fruits frais des palmiers à huile du Nigeria.

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References

  1. Alibert R. (1945) Pourquoi et comments on fait la fecondation artificelle sur le palmier à huile. Farm and Forest 6, 27.Google Scholar
  2. Basri M. W., Hoong H. W., Siburat S. and The C. L. (1998) Effect of weevil pollination on oil extraction rate (OER). Proceedings of a Seminar on Opportunity for Maximizing Production through Better OER and Offshore Investment in Oil Palm, 14–15 December 1998, Bangi, Malaysia.Google Scholar
  3. Beirnaert A. (1935) Introduction a la biologie florale du palmier a huile, Elaeis guineensis (Jacq.). Pubis INEAC Serie Sci. No. 5.Google Scholar
  4. Donough C. R. and Law I. H. (1987) The effect of weevil pollination on yield and profitability at Pamol plantations. Proceedings of the 1987 International Oil Palm, Palm oil Conferences 11, 523–527.Google Scholar
  5. Donough C. R., Chew K. W. and Law I. H. (1996) Effect of fruit set on OER and KER: results from studies at Pamol Estates (Sabah) Sdn Bhd. Planter 72, 203–219.Google Scholar
  6. Hartley C. W. S. (1988) The Oil Palm (Elaeis guineensis) Jacq. Longman Scientific & Technical. 761 pp.Google Scholar
  7. Lepesme P. (1946) Les charancons floricoles des palmiers. Agro. Trop. 1, 400.Google Scholar
  8. Mariau D., Houssou M., Lecoustre R. and Ndigui B. (1991) Oil palm pollinating insects and fruitset rates in West Africa (1). Oléagineux 46, 43–51.Google Scholar
  9. Rao V., Gomez M., Chayawat N., Chia C. C. and Lim C. C. (2001) Some factors influencing oil bunch, OER and KER. Proceedings of the 2001 PIPOC International Palm Oil Congress, pp. 167–199.Google Scholar
  10. Syed, R. A. (1978) Studies on pollination of oil palm in West Africa and Malaysia. Report of the Commonwealth Institute of Biological Control. 48 pp.Google Scholar
  11. Syed R. A. (1979) Studies on oil palm pollination by insects. Bull. Entomol. Res. 69, 213–224.CrossRefGoogle Scholar
  12. Syed R. A. (1981a) Pollinating thrips of oil palm in West Malaysia. Planter 57, 62–81.Google Scholar
  13. Syed R. A. (1981b) Insect pollination of oil palm: feasibility of introducing Elaeidobius spp. into Malaysia. The Oil Palm in Agriculture in the Eighties. Proceedings of Malaysia Oil Palm Conference. 27 pp.Google Scholar
  14. Syed R. A., Law I. H. and Corley R. H. V. (1982) Insect pollination of the oil palm: introduction, establishment and pollinating efficiency of E. himerunicus in Malaysia. Planter 58, 547.Google Scholar

Copyright information

© ICIPE 2004

Authors and Affiliations

  • C. I. Aisagbonhi
    • 1
    Email author
  • Norman Kamarudin
    • 2
  • C. O. Okwuagwu
    • 3
  • Mohd Basri Wahid
    • 2
  • Trevor Jackson
    • 4
  • V. Adaigbe
    • 2
  1. 1.Division of EntomologyNigerian Institute for Oil Palm Research (NIFOR)Benin CityNigeria
  2. 2.Malaysian Palm Oil BoardMalaysia
  3. 3.Division of Plant BreedingNIFORNigeria
  4. 4.AgResearch LimitedNew Zealand

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