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Australasian Plant Pathology

, Volume 40, Issue 1, pp 76–86 | Cite as

Variable resistance to Quambalaria pitereka in spotted gum reveal opportunities for disease screening

  • G. S. PeggEmail author
  • A. J. Carnegie
  • M. J. Wingfield
  • A. Drenth
Article

Abstract

Quambalaria shoot blight, caused by the fungus Quambalaria pitereka, is a serious disease affecting the development of spotted gum (Corymbia citriodora subsp. citriodora, C. citriodora subsp. variegata, C. henryi and C. maculata) plantations in subtropical and tropical Australia. Incorporation of screening for resistance to Q. pitereka into current breeding programs is essential for the future development of plantations using spotted gum and Corymbia hybrids. The aim of this study was to determine whether there is variability in resistance among and within different species provenances and families of spotted gum to infection by Q. pitereka. A secondary aim was to consider whether the origin of seed source is a significant indicator of resistance to Q. pitereka. Assessments were conducted in trials consisting of spotted gum provenances, families and clones, all at the same site with high levels of disease pressure and with optimum climatic conditions for disease development. While all species and provenances of spotted gum could be infected by Q. pitereka, results showed that there are high levels of variability in resistance between and within species, provenances and families, indicating the potential to select for disease resistance. Provenance was shown to be an unreliable indicator of resistance to Q. pitereka.

Keywords

Shoot blight Provenance Quambalaria 

Notes

Acknowledgments

We thank Queensland Department Primary Industries Innovation and Biosecurity Program Investment, Forest Plantations Queensland, Integrated Tree Cropping, Forest Enterprises Australia and Forests NSW for providing the necessary funding for this research. We also thank Dr Helen Nahrung for assistance with statistical analysis of field and glasshouse data. Forests NSW, in particular Michael Henson and Helen Smith, allowed access to their spotted gum trials for which we are most grateful.

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Copyright information

© Australasian Plant Pathology Society Inc. 2010

Authors and Affiliations

  • G. S. Pegg
    • 1
    • 2
    Email author
  • A. J. Carnegie
    • 3
  • M. J. Wingfield
    • 4
  • A. Drenth
    • 2
  1. 1.Agri-Science QueenslandHorticulture and Forestry ScienceDutton PkAustralia
  2. 2.Tree Pathology CentreThe University of Queensland/Agri-Science QueenslandBrisbaneAustralia
  3. 3.Forest Health & Productivity AssessmentIndustry and Investment NSWBeecroftAustralia
  4. 4.Forestry and Agricultural Biotechnology InstituteUniversity of PretoriaPretoriaSouth Africa

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