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International Journal of Tropical Insect Science

, Volume 24, Issue 3, pp 242–248 | Cite as

Field distribution of banana weevil Cosmopolites sordidus (Germar) adults in cooking banana stands in Uganda

  • C. S. GoldEmail author
  • G. Night
  • P. E. Ragama
  • G. H. Kagezi
  • W. Tinzaara
  • A. M. K. Abera
Article

Abstract

The banana weevil, Cosmopolites sordidus (Germar), is a nocturnal insect that is not readily observed in banana fields. Knowledge on its distribution is essential for the design of management strategies that target the adult stage. Marked weevils were released into seven-year-old banana plots. Ten days later the plots were systematically sampled for adult weevils by first removing the banana leaf mulch and residues, searching subsections of the soil to depths of 3 and 25 cm and, finally, removal and dissection of the banana mats. Of the marked weevils, 62, 56 and 82% respectively, were recovered in three trials. Most weevils were found in close association with either the banana mat (46–66%) or with cut residues lying on the ground between the mats (24–31%). Lesser numbers were found in the leaf mulch and in the top 3 cm of soil away from the mat. The distribution of weevils is likely to be influenced by crop management practices and the availability of residues and by the presence of mulch. Implications for banana weevil IPM are discussed.

Key words

banana banana weevil Cosmopolites sordidus crop residues field distribution 

Mots clés

banane charançon du bananier Cosmopolites sordidus résidus de culture distribution au champ 

Résumé

Le charançon du bananier, Cosmopolites sordidus (Germar), est un insecte nocturne qui n’est pas facilement observé dans les plantations de bananiers. La connaissance de sa distribution est essentielle pour élaborer des stratégies de lutte contre le stade adulte. Des adultes marqués ont été lâchés dans trois plantations de bananiers âgées de 7 ans. Un échantillonnage systématique des adultes a été réalisé 10 jours plus tard dans les résidus de feuilles au pied des troncs, dans le sol jusqu’à une profondeur de 25 cm ainsi que dans les gaines foliaires; 62,56 et 82% des adultes marqués ont été retrouvés dans les trois essais. La plupart des charançons ont été retrouvés dans la gaine foliaire (46–66%) ou dans les débris de gaines foliaires reposant sur le sol (24–31%). Peu d’adultes ont été retrouvés dans les débris de feuilles ou dans les 3 premiers centimètres de sol. Il apparaît que la distribution des charançons est influencée par les pratiques culturales et la disponibilité en résidus ainsi que par le paillage. Les conséquences de ces observations sur la lutte intégrée contre le charançon du bananier sont discutées.

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Copyright information

© ICIPE 2004

Authors and Affiliations

  • C. S. Gold
    • 1
    Email author
  • G. Night
    • 1
  • P. E. Ragama
    • 1
  • G. H. Kagezi
    • 1
  • W. Tinzaara
    • 2
  • A. M. K. Abera
    • 1
  1. 1.International Institute of Tropical AgricultureKampalaUganda
  2. 2.Ugandan National Banana Research ProgrammeKampalaUganda

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