Infection and disease development of Quambalaria spp. on Corymbia and Eucalyptus species

Geoff S Pegg; R I Webb; A J Carnegie; M J Wingfield; A Drenth

doi:10.1111/j.1365-3059.2009.02087.x

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Infection and disease development of Quambalaria spp. on Corymbia and Eucalyptus species

Journal article

Peer reviewed

Infection and disease development of Quambalaria spp. on Corymbia and Eucalyptus species

Geoff S Pegg, R I Webb, A J Carnegie, M J Wingfield and A Drenth

Plant Pathology, Vol.58(4), pp.642-654

2009

DOI: https://doi.org/10.1111/j.1365-3059.2009.02087.x

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Abstract

Corymbia spp.

Eucalyptus spp.

quambalaria shoot blight

symptomatology

Quambalaria spp. are eucalypt leaf and shoot pathogens of growing global importance, yet virtually nothing is known regarding the manner in which they infect and colonize their hosts. A study of the infection process of Q. pitereka and Q. eucalypti on Corymbia and Eucalyptus species was thus undertaken using light, scanning and transmission electron microscopy after artificial inoculation. Conidial germination was triggered when relative humidity levels exceeded 90% and commenced within 2 h in the presence of free water. Light reduced germination but did not prevent germination from occurring. Conidial germination and hyphal growth occurred on the upper and lower leaf surfaces with penetration occurring via the stomata or wounds on the leaf surface or juvenile stems. There was no evidence of direct penetration of the host. Following penetration through the stomata, Q. pitereka and Q. eucalypti hyphae grew only intercellularly without the formation of haustoria or interaction apparatus, which is characteristic of the order Microstromatales. Instead, the presence of an interaction zone is demonstrated in this paper. Conidiophores arose through stomatal openings producing conidia 7 days after infection. © 2009 BSPP.

Details

Title: Infection and disease development of Quambalaria spp. on Corymbia and Eucalyptus species
Authors: Geoff S Pegg (Author) - University of Queensland
R I Webb (Author) - University of Queensland
A J Carnegie (Author) - NSW Department of Primary Industries
M J Wingfield (Author) - University of Pretoria, South Africa
A Drenth (Author) - University of Queensland
Publication details: Plant Pathology, Vol.58(4), pp.642-654
Publisher: Wiley-Blackwell Publishing Ltd.
Date published: 2009
DOI: 10.1111/j.1365-3059.2009.02087.x
ISSN: 0032-0862
Organisation Unit: University of the Sunshine Coast, Queensland
Language: English
Record Identifier: 99449355302621
Output Type: Journal article

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Collaboration types: Domestic collaboration; International collaboration
Web Of Science research areas: Agronomy; Plant Sciences