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Phomopsis husk rot of macadamia in Australia and South Africa caused by novel Diaporthe species

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Wrona, C. J., Mohankumar, V., Schoeman, M. H., Tan, Y. P., Shivas, R. G., Jeff-Ego, O. S. and Akinsanmi, O. A. (2020) Phomopsis husk rot of macadamia in Australia and South Africa caused by novel Diaporthe species. Plant Pathology, 69 (5). pp. 911-921. ISSN 0032-0862

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Article Link: https://doi.org/10.1111/ppa.13170

Publisher URL: https://bsppjournals.onlinelibrary.wiley.com/doi/abs/10.1111/ppa.13170


Phomopsis husk rot (PHR) in macadamia is a disease of economic importance in major commercial production areas in Australia and South Africa. Effective control of PHR is hindered by limited knowledge about its aetiology and epidemiology. The diversity and pathogenicity of more than 50 isolates of Diaporthe associated with PHR in macadamia orchards in Australia and South Africa was assessed. Multilocus phylogenetic analyses of DNA sequences of the ITS, tef1α, and tub2 gene loci revealed four novel clades that are described as Diaporthe australiana sp. nov., D. drenthii sp. nov., D. macadamiae sp. nov., and D. searlei sp. nov. Pathogenicity tests with representative isolates found that all four species caused PHR of varying severity between and within species, as well as between the two macadamia cultivars HAES 344 and HAES 816. The Australian species, D. australiana, was the most aggressive species compared with the three South African species. This study improves our understanding of the aetiology of PHR in macadamia and paves the way for more effective disease management.

Item Type:Article
Business groups:Biosecurity Queensland
Subjects:Plant culture > Fruit and fruit culture > Nuts
Plant pests and diseases
Plant pests and diseases > Plant pathology
Plant pests and diseases > Pest control and treatment of diseases. Plant protection
Live Archive:12 Aug 2020 21:48
Last Modified:28 Aug 2023 06:25

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