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Quambalaria species: increasing threat to eucalypt plantations in Australia

Pegg, G.S. and Carnegie, A.J. and Wingfield, M.J. and Drenth, A. (2009) Quambalaria species: increasing threat to eucalypt plantations in Australia. Southern Forests. a Journal of Forest Science, 71 (2). pp. 111-114.

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Article Link(s): http://dx.doi.org/10.2989/SF.2009.71.2.4.819

Publisher URL: http://www.informaworld.com/smpp/home~db=all

Abstract

Spotted gum (Corymbia citriodora subsp. variegata and C. maculata) is a valuable source of commercial timber and suitable for a wide range of different soil types in eastern Australia. The main biological constraint to further expansion of spotted gum plantations is Quambalaria shoot blight caused by the fungus Quambalaria pitereka. Surveys conducted to evaluate the impact of Quambalaria shoot blight have shown that the disease is present in all spotted gum plantations and on a range of Corymbia species and hybrids in subtropical and tropical regions surveyed in eastern Australia. More recently, Q. eucalypti has also been identified from a range of Eucalyptus species in these regions. Both pathogens have also been found associated with foliage blight and die-back of amenity trees and Q. pitereka in native stands of Corymbia species, which is the probable initial infection source for plantations. Infection by Q. pitereka commonly results in the repeated destruction of the growing tips and the subsequent formation of a bushy crown or death of trees in severe cases. In comparison, Q. eucalypti causes small, limited lesions and has in some cases been associated with insect feeding. It has not been recorded as causing severe shoot and stem blight. A better understanding of factors influencing disease development and host-pathogen interactions is essential in the development of a disease management strategy for these poorly understood but important pathogens in the rapidly expanding eucalypt (Corymbia and Eucalyptus spp.) plantation industry in subtropical and tropical eastern Australia.

Item Type:Article
Additional Information:© The State of Queensland (through the Department of Employment, Economic Development and Innovation). © Taylor and Francis.
Keywords:Corymbia; Quambalaria shoot blight; fungus; spotted gum; Eucalypt plantation industry.
Subjects:Plant pests and diseases > Individual or types of plants or trees
Forestry
Deposited On:31 Jan 2011 05:55
Last Modified:20 Apr 2011 00:26

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