Molecular markers confirm the origin and reveal complex global invasion history of the eucalyptus gall wasp, Leptocybe invasa

Gudrun Dittrich-Schroder; Brett P Hurley; Michael J Wingfield; Bernard Slippers; Simon A Lawson; Helen F Nahrung

doi:10.1603/ICE.2016.113482

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Molecular markers confirm the origin and reveal complex global invasion history of the eucalyptus gall wasp, Leptocybe invasa

Gudrun Dittrich-Schroder, Brett P Hurley, Michael J Wingfield, Bernard Slippers, Simon A Lawson and Helen F Nahrung

International Congress of Entomology (ICE), XXV (Orlando, United States, 25-Sep-2016–30-Sep-2016)

Entomological Society of America

2016

DOI: https://doi.org/10.1603/ICE.2016.113482

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Abstract

Forestry Sciences

Plant Biology

The Eucalyptus gall wasp, Leptocybe invasa (Hymenoptera: Eulophidae), has spread rapidly to all continents where Eucalyptus spp. are planted and is now one of the most important insect pests threatening global plantation forestry. In order to study the routes and extent of L. invasa introductions globally, we characterised the genetic diversity of populations from the purported origin and invaded regions of the wasp. From the 511 L. invasa specimens, 26 cytochrome oxidase I (COI) haplotypes were identified, of which three were found in the invaded range. Two of the three distinct lineages, which could represent cryptic species, appear to have been independently introduced into different parts of the world. One lineage (A) occurs throughout the invaded range, and is found exclusively in Europe, the Middle East, South America and most of Africa. The second lineage (B) co-occurs with lineage A in Laos, South Africa, Thailand and Vietnam. The third lineage (C) occurs only in Australia. Analyses using 13 newly developed simple sequence repeat (SSR) markers in sub-populations of L. invasa supported the distinction of the three lineages. These findings underpin the weakness of currently applied quarantine measures to halt the movement of plantation pests and question the suitability of measures being used to control L. invasa. Ongoing research using the SSR marker data should confirm the possible existence of cryptic species in the L. invasa populations, hybridization or admixture between the two lineages, and the reproductive mode of the pest in its invasive range.

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Title: Molecular markers confirm the origin and reveal complex global invasion history of the eucalyptus gall wasp, Leptocybe invasa
Authors: Gudrun Dittrich-Schroder (Author) - University of Pretoria, South Africa
Brett P Hurley (Author) - University of Pretoria, South Africa
Michael J Wingfield (Author) - University of Pretoria, South Africa
Bernard Slippers (Author) - University of Pretoria, South Africa
Simon A Lawson (Author) - University of the Sunshine Coast - Faculty of Arts, Business and Law
Helen F Nahrung (Author) - University of the Sunshine Coast - Faculty of Arts, Business and Law
Conference details: International Congress of Entomology (ICE), XXV (Orlando, United States, 25-Sep-2016–30-Sep-2016)
Publisher: Entomological Society of America
Date published: 2016
DOI: 10.1603/ICE.2016.113482
Organisation Unit: University of the Sunshine Coast, Queensland; Forest Industries Research Centre; Forest Research Institute
Language: English
Record Identifier: 99451016902621
Output Type: Conference presentation

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