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First report of entomopathogenic nematodes from Tanzania and their virulence against larvae and adults of the banana weevil Cosmopolites sordidus (Coleoptera: Curculionidae)

Published online by Cambridge University Press:  28 September 2011

S. Mwaitulo ,
S. Haukeland ,
M.-G. Sæthre ,
A. Laudisoit  and
A.P. Maerere
S. Mwaitulo
Affiliation:
Department of Crop Science and Production, Sokoine University of Agriculture, PO Box 3005, Morogoro, Tanzania
S. Haukeland*
Affiliation:
Bioforsk – Norwegian Institute for Agricultural and Environmental Research, Hogskoleveien 7, 1432As, Norway
M.-G. Sæthre
Affiliation:
Bioforsk – Norwegian Institute for Agricultural and Environmental Research, Hogskoleveien 7, 1432As, Norway
A. Laudisoit
Affiliation:
VAR, Food Borne and Highly Pathogenic Zoonoses, 99, Groeselenberg, 1180Brussels, Belgium Evolutionary Ecology Group, University of Antwerp, 171 Groenenborgerlaan, 2020Antwerp, Belgium
A.P. Maerere
Affiliation:
Department of Crop Science and Production, Sokoine University of Agriculture, PO Box 3005, Morogoro, Tanzania
*
*E-mail: [email protected]
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Abstract

A survey on the occurrence of entomopathogenic nematodes (EPNs) was conducted in selected banana fields from three regions in Tanzania, namely Mbeya (Southern Highlands), Morogoro (Lowland) and Pwani (Coast). The main objective of this study was to isolate EPNs naturally occurring in banana fields in Tanzania and to test their effect on banana weevil (Cosmopolites sordidus Germar 1824). We report for the first time the presence of EPNs in Tanzania where four (4.4%) out of 90 samples contained nematodes in the genera Steinernema and Heterorhabditis. EPNs were only isolated in the coastal region in soils with a high sand content. The virulence of nine EPN isolates was tested against larvae and adults of C. sordidus. All isolates caused mortality of the larval stages, whereas the adults appeared resistant to nematode infection. Larval mortality was found to increase significantly with increasing nematode dose. It was also shown that nematodes were able to penetrate and establish in the banana weevil larvae in increasing numbers with increasing nematode dose. The study indicates the potential for including EPNs in management strategies of banana weevil.

Keywords

banana weevilbiological controlCosmopolites sordidusentomopathogenic nematodes
Type
Research Paper
Information
International Journal of Tropical Insect Science , Volume 31 , Issue 3 , September 2011 , pp. 154 - 161
Copyright
Copyright © ICIPE 2011

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