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

Wrona, Christopher J. and Mohankumar, Vheena and Schoeman, Maritha H. and Tan, Yu P. and Shivas, Roger G.S. and Jeff-Ego, Olumide S. and Akinsanmi, Olufemi 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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Abstract

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.


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Item Type: Article (Commonwealth Reporting Category C)
Refereed: Yes
Item Status: Live Archive
Faculty/School / Institute/Centre: Current - Institute for Life Sciences and the Environment - Centre for Crop Health (24 Mar 2014 -)
Faculty/School / Institute/Centre: Current - Institute for Life Sciences and the Environment - Centre for Crop Health (24 Mar 2014 -)
Date Deposited: 15 Jul 2020 00:10
Last Modified: 27 Jul 2020 01:15
Uncontrolled Keywords: disease severity; fruit pericarp; Phomopsis; Proteaceae; tree nut
Fields of Research (2008): 07 Agricultural and Veterinary Sciences > 0706 Horticultural Production > 070603 Horticultural Crop Protection (Pests, Diseases and Weeds)
06 Biological Sciences > 0605 Microbiology > 060505 Mycology
Socio-Economic Objectives (2008): E Expanding Knowledge > 97 Expanding Knowledge > 970106 Expanding Knowledge in the Biological Sciences
E Expanding Knowledge > 97 Expanding Knowledge > 970107 Expanding Knowledge in the Agricultural and Veterinary Sciences
Identification Number or DOI: 10.1111/ppa.13170
URI: http://eprints.usq.edu.au/id/eprint/38602

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