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

Published online by Cambridge University Press:  28 February 2007

C.S. Gold ,
G. Night ,
P.E. Ragama ,
G.H. Kagezi ,
W. Tinzaara  and
A.M.K. Abera
C.S. Gold*
Affiliation:
International Institute of Tropical Agriculture, PO Box 7878, Kampala, Uganda
G. Night
Affiliation:
International Institute of Tropical Agriculture, PO Box 7878, Kampala, Uganda
P.E. Ragama
Affiliation:
International Institute of Tropical Agriculture, PO Box 7878, Kampala, Uganda
G.H. Kagezi
Affiliation:
International Institute of Tropical Agriculture, PO Box 7878, Kampala, Uganda
W. Tinzaara
Affiliation:
Ugandan National Banana Research Programme, PO Box 7065, Kampala, Uganda
A.M.K. Abera
Affiliation:
International Institute of Tropical Agriculture, PO Box 7878, Kampala, Uganda
*
*Email: cgold@cgiar.org
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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.

Keywords

bananabanana weevilCosmopolites sordiduscrop residuesfield distribution
Type
Research Article
Information
International Journal of Tropical Insect Science , Volume 24 , Issue 3 , September 2004 , pp. 242 - 248
Copyright
Copyright © ICIPE 2004

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