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The influence of crop management on banana weevil, Cosmopolites sordidus (Coleoptera: Curculionidae) populations and yield of highland cooking banana (cv. Atwalira) in Uganda

Published online by Cambridge University Press:  09 March 2007

N.D.T.M. Rukazambuga ,
C.S. Gold ,
S.R. Gowen  and
P. Ragama
N.D.T.M. Rukazambuga
Affiliation:
IITA/ESARC, PO Box 7878, Kampala, Uganda
C.S. Gold*
Affiliation:
IITA/ESARC, PO Box 7878, Kampala, Uganda
S.R. Gowen
Affiliation:
Reading University, Department of Agriculture, Reading, RG6 6AT, Berkshire, UK
P. Ragama
Affiliation:
IITA/ESARC, PO Box 7878, Kampala, Uganda
*
*Fax: 256 41 223494 E-mail: c.gold@imul.com
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Abstract

A field study was undertaken in Uganda using highland cooking banana (cv. Atwalira) to test the hypothesis that bananas grown under stressed conditions are more susceptible to attack by Cosmopolites sordidus (Germar). Four banana treatments were employed to create different levels of host-plant vitality: (1) high stress: intercrop with finger millet; (2) moderate stress: monoculture without soil amendments; (3) low stress: monoculture with manure; (4) high vigour: monoculture with continuous mulch and manure. Adult C. sordidus were released at the base of banana mats 11 months after planting and populations were monitored for three years using mark and recapture methods. Cosmopolites sordidus density was greatest in the mulched plots which may have reflected increased longevity and/or longer tenure time in moist soils. Lowest C. sordidus numbers were found in intercropped banana. Damage, estimated as percentage corm tissue consumed by larvae, was similar among treatments. However, the total amount of tissue consumed was greater in mulched banana than in other systems. Plants supporting the heaviest levels of C. sordidus damage displayed bunch size reductions of 40–55%. Banana yield losses ranged from 14–20% per plot with similar levels in the intercropped and mulched systems. Yield reductions, reported as t ha-1, were twice as high in the mulched system as in the intercrop. The results from this study indicate that C. sordidus problems are not confined to stressed banana systems or those with low levels of management, but that the weevil can also attain pest status in well-managed and productive banana stands.

Type
Research Article
Information
Bulletin of Entomological Research , Volume 92 , Issue 5 , October 2002 , pp. 413 - 421
Copyright
Copyright © Cambridge University Press 2002

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