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Publication Details
AFRICAN RESEARCH NEXUS
SHINING A SPOTLIGHT ON AFRICAN RESEARCH
agricultural and biological sciences
Age-related susceptibility of Eucalyptus species to Phytophthora boodjera
Plant Pathology, Volume 66, No. 3, Year 2017
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Description
Phytophthora boodjera is a newly described pathogen causing damping off and mortality of Eucalyptus seedlings in Western Australian nurseries. This study evaluated the age-related susceptibility of several taxa of mallee Eucalyptus to P. boodjera in sterilized washed river sand-infestation pot trials. Phytophthora cinnamomi and P. arenaria were included for comparison. Seedlings of Eucalyptus taxa were inoculated at 0, 2, 4, 12 and 88 weeks with individual Phytophthora isolates. Pre-emergent mortality in the presence of Phytophthora was almost 100%. Post-emergent mortality was 50–100%, depending on isolate, compared to 0% for the control. Mortality was also high for inoculated 1 month-old seedlings (46–68%) and root length of surviving seedlings was severely reduced. Death from root infection was not observed for seedlings inoculated at 12 and 88 weeks, but they developed root necrosis and reduced root dry weight compared to non-inoculated controls. Phytophthora boodjera is a pre- and post-emergent pathogen of mallee eucalypts. These eucalypts are susceptible to P. boodjera at all life stages tested, but the mortality rates declined with plant age. Similar results were obtained for P. cinnamomi and P. arenaria. The events leading to its recent appearance in the nurseries remain unknown and further investigations are underway to determine if this is an introduced or endemic pathogen. The approach used here to understand the impact of a Phytophthora species on multiple hosts at different seedling ages is novel and sets a benchmark for future work. © 2016 British Society for Plant Pathology
Authors & Co-Authors
Stukely, Michael J.C.
Australia, Perth
Crop Variety Testing Group
Barber, Paul Anthony
Australia, Perth
Murdoch University
Australia, Perth
Arborcarbon Pty Ltd
Hardy, Giles E.St J.
Australia, Perth
Murdoch University
Burgess, Treena Isobel
Australia, Perth
Murdoch University
Statistics
Citations: 20
Authors: 4
Affiliations: 4
Identifiers
Doi:
10.1111/ppa.12592
ISSN:
00320862