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Survivorship and development rates of banana weevils reared on excised plant material of different banana cultivars

Published online by Cambridge University Press:  11 June 2010

Gertrude Night ,
Clifford S. Gold  and
Alison G. Power
Gertrude Night*
Affiliation:
Department of Ecology and Evolutionary Biology, Cornell University, Ithaca, NY14853, USA
Clifford S. Gold
Affiliation:
Centro Internacional de Agricultura Tropical (CIAT), PO Box 6247, Kampala, Uganda
Alison G. Power
Affiliation:
Department of Ecology and Evolutionary Biology, Cornell University, Ithaca, NY14853, USA
*
*gmn27@yahoo.com
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Abstract

Host plant resistance is an important tool in the management of the banana weevil Cosmopolites sordidus (Germar). Although ovipositing females do not discriminate between resistant and susceptible cultivars, plants of resistant cultivars have smaller larval populations and sustain less damage in the field. These observations suggest that lower damage levels observed in resistant cultivars reflect larval success. This study was carried out to evaluate laboratory screening of banana cultivars as a rapid screening method for resistance to the banana weevil by determining the influence of cultivars on weevil survivorship, development duration and adult weight. Larvae were raised on corm pieces of two susceptible, three intermediate and four resistant cultivars, resistance categories having been determined from a previous field screening trial. The developmental period was prolonged in resistant cultivars. However, cultivars had less influence on survivorship and adult weight. Moreover, the ranking of survivorship did not correlate with resistance levels observed in the field. The implications of these findings for laboratory screening of cultivars for resistance to C. sordidus are highlighted.

Keywords

host plant resistancescreeningsurvivorshipdevelopment durationbanana weevilCosmopolites sordidus
Type
Research Paper
Information
International Journal of Tropical Insect Science , Volume 30 , Issue 2 , June 2010 , pp. 77 - 83
Copyright
Copyright © ICIPE 2010

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