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Selection of assessment methods for evaluating banana weevil Cosmopolites sordidus (Coleoptera: Curculionidae) damage on highland cooking banana (Musa spp., genome group AAA-EA)

Published online by Cambridge University Press:  09 March 2007

C.S. Gold ,
P.E. Ragama ,
R. Coe  and
N.D.T.M. Rukazambuga
C.S. Gold*
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
R. Coe
Affiliation:
World Agroforestry Center, PO Box 30677, Nairobi, Kenya
N.D.T.M. Rukazambuga
Affiliation:
International Institute of Tropical Agriculture, PO Box 7878, Kampala, Uganda Rural Sector Support Project, Ministry of Agriculture, PO Box 6961, Kigali, Rwanda
*
*Fax: 256 41 223484 E-mail: [email protected]
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Abstract

Cosmopolites sordidus (Germar) is an important pest on bananas and plantains. Population build-up is slow and damage becomes increasingly important in successive crop cycles (ratoons). Yield loss results from plant loss, mat disappearance and reduced bunch size. Damage assessment requires destructive sampling and is most often done on corms of recently harvested plants. A wide range of damage assessment methods exist and there are no agreed protocols. It is critical to know what types of damage best reflect C. sordidus pest status through their relationships with yield loss. Multiple damage assessment parameters (i.e. for the corm periphery, cortex and central cylinder) were employed in two yield loss trials and a cultivar-screening trial in Uganda. Damage to the central cylinder had a greater effect on plant size and yield loss than damage to the cortex or corm periphery. In some cases, a combined assessment of damage to the central cylinder and cortex showed a better relationship with yield loss than an assessment of the central cylinder alone. Correlation, logistic and linear regression analyses showed weak to modest correlations between damage to the corm periphery and damage to the central cylinder. Thus, damage to the corm periphery is not a strong predictor of the more important damage to the central cylinder. Therefore, C. sordidus damage assessment should target the central cylinder and cortex.

Type
Review Article
Information
Bulletin of Entomological Research , Volume 95 , Issue 2 , April 2005 , pp. 115 - 123
Copyright
Copyright © Cambridge University Press 2005

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