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Phylogeographic structure of Teretrius nigrescens (Coleoptera: Histeridae) predator of the invasive post harvest pest Prostephanus truncatus (Coleoptera: Bostrichidae)

Published online by Cambridge University Press:  15 April 2011

B.A. Omondi ,
J. van den Berg ,
D. Masiga  and
F. Schulthess
B.A. Omondi*
Affiliation:
Molecular Biologyand Biotechnology Unit, International Centre of Insect Physiology and Ecology, PO Box 30772–00100, Nairobi, Kenya School of Environmental Sciences and Development, North West University, Private Bag X6001, Potchefstroom 2520South Africa Biological Control Unit, International Centre of Insect Physiology and Ecology, PO Box 30772–00100, Nairobi, Kenya
J. van den Berg
Affiliation:
School of Environmental Sciences and Development, North West University, Private Bag X6001, Potchefstroom 2520South Africa
D. Masiga
Affiliation:
Molecular Biologyand Biotechnology Unit, International Centre of Insect Physiology and Ecology, PO Box 30772–00100, Nairobi, Kenya
F. Schulthess
Affiliation:
Biological Control Unit, International Centre of Insect Physiology and Ecology, PO Box 30772–00100, Nairobi, Kenya
*
*Author for correspondence Fax: +46-40-461991 E-mail: [email protected]
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Abstract

The invasive larger grain borer Prostephanus truncatus (Horn) is the most important pest of farm-stored maize in Africa. It was introduced into the continent from Mesoamerica in the late 1970s and by 2008 had spread to at least 18 countries. Classical biological control using two populations of the predator Teretrius nigrescens Lewis achieved long-term and cost effective control in warm-humid areas, but not in cool and hot-dry zones. The present study investigated the phylogenetic relationships between geographical populations of the predator. Ten populations of T. nigrescens were studied using randomly amplified polymorphic DNA polymerase chain reaction (RAPD-PCR), sequence analysis of mitochondrial Cytochrme oxydase 1 (mtCOI) gene and ribosomal internally transcribed spacers (ITS) 1, 5.8S and ITS2. The mtCOI variation revealed two clades associated with geographical regions in Central America. It also reveals a significant isolation by distance between populations and considerable genetic shifts in laboratory rearing. RAPD-PCR did not reveal any potential SCAR diagnostic markers. The ITS variation mainly involved insertions and deletions of simple sequence repeats even within individuals. This study reveals the existence of two different mitochondrial lineages of the predator, associated with the geographical origin of populations distinguishable by fixed mutations on the mtCOI gene. The populations of T. nigrescens released in Africa belonged to two different clades from Meso America, namely south (released in West Africa) and north (released in eastern Africa). However, more polymorphic markers are required to clarify the observations in demographic time scales.

Keywords

Prostephanus truncatusTeretrius nigrescensgeographical racesgenetic diversitycytochrome oxidase 1
Type
Research Paper
Information
Bulletin of Entomological Research , Volume 101 , Issue 5 , October 2011 , pp. 521 - 532
Copyright
Copyright © Cambridge University Press 2011

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