Dry flower disease of Macadamia in Australia caused by Neopestalotiopsis macadamiae sp. nov. and Pestalotiopsis macadamiae sp. nov
Article
Article Title | Dry flower disease of Macadamia in Australia caused by Neopestalotiopsis macadamiae sp. nov. and Pestalotiopsis macadamiae sp. nov |
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ERA Journal ID | 2647 |
Article Category | Article |
Authors | Akinsanmi, Olufemi A. (Author), Nisa, Shaheen (Author), Jeff-Ego, Olumdie S. (Author), Shivas, Roger G. (Author) and Drenth, Andre (Author) |
Journal Title | Plant Disease: an international journal of applied plant pathology |
Journal Citation | 101 (1), pp. 45-53 |
Number of Pages | 9 |
Year | 2017 |
Publisher | American Phytopathological Society |
Place of Publication | United States |
ISSN | 0191-2917 |
1943-7692 | |
Digital Object Identifier (DOI) | https://doi.org/10.1094/PDIS-05-16-0630-RE |
Web Address (URL) | https://apsjournals.apsnet.org/doi/10.1094/PDIS-05-16-0630-RE |
Abstract | Incidence of dry flower disease of macadamia (Macadamia integrifolia), expressed as blight of the flowers and necrosis and dieback of the rachis, is increasing in Australia. In the 2012–13 production season, incidence of dry flower disease resulted in 10 to 30% yield loss in the affected orchards. Etiology of the disease has not been established. This study was established to characterize the disease and identify the causal pathogen. A survey of the major macadamia-producing regions in Australia revealed dry flower disease symptoms regardless of cultivar or location at all stages of raceme development. Based on colony and conidial morphology, the majority (41%) of fungal isolates obtained from tissue samples were identified as Pestalotiopsis and Neopestalotiopsis spp. The phylogeny of the combined partial sequence of the internal transcribed spacer, β-tubulin, and translation elongation factor 1-α gene loci segregated the isolates into two well-supported clades, independent of location or part of the inflorescence affected. Further morphological examination supported the establishment of two new species, which are formally described as Neopestalotiopsis macadamiae sp. nov. and Pestalotiopsis macadamiae sp. nov. Using spore suspensions of isolates of both species, Koch’s postulates were fulfilled on three macadamia cultivars at all stages of raceme development. To our knowledge, this is the first report of species of Neopestalotiopsis and Pestalotiopsis as causal agents of inflorescence disease in macadamia. |
Keywords | macadamia; dry flower disease; Neopestalotiopsis macadamiae; Pestalotiopsis macadamiae |
ANZSRC Field of Research 2020 | 310805. Plant pathology |
Public Notes | Files associated with this item cannot be displayed due to copyright restrictions. |
Byline Affiliations | University of Queensland |
Department of Agriculture and Fisheries, Queensland | |
Institution of Origin | University of Southern Queensland |
https://research.usq.edu.au/item/q4428/dry-flower-disease-of-macadamia-in-australia-caused-by-neopestalotiopsis-macadamiae-sp-nov-and-pestalotiopsis-macadamiae-sp-nov
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