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An assessment of Pythium spp. associated with soft rot disease of ginger (Zingiber officinale) in Queensland, Australia

Le, Duy Phu and Smith, Mike K. and Aitken, Elizabeth A. B. (2016) An assessment of Pythium spp. associated with soft rot disease of ginger (Zingiber officinale) in Queensland, Australia. Australasian Plant Pathology, 45 (4). pp. 377-387. ISSN 0815-3191

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Article Link(s): http://dx.doi.org/10.1007/s13313-016-0424-5

Abstract

In Australia, Pythium soft rot (PSR) outbreaks caused by P. myriotylum were reported in 2009 and since then this disease has remained as a major concern for the ginger industry. From 2012 to 2015, a number of Pythium spp. were isolated from ginger rhizomes and soil from farms affected by PSR disease and assessed for their pathogenicity on ginger. In this study, 11 distinct Pythium spp. were recovered from ginger farms in Queensland, Australia and species identification and confirmation were based on morphology, growth rate and ITS sequences. These Pythium spp. when tested showed different levels of aggressiveness on excised ginger rhizome. P. aphanidemartum, P. deliense, P. myriotylum, P. splendens, P. spinosum and P. ultimum were the most pathogenic when assessed in vitro on an array of plant species. However, P. myriotylum was the only pathogen, which was capable of inducing PSR symptoms on ginger at a temperature range from 20 to 35 °C. Whereas, P. aphanidermatum only attacked and induced PSR on ginger at 30 to 35 °C in pot trials. This is the first report of P. aphanidermatum inducing PSR of ginger in Australia at high temperatures. Only P. oligandrum and P. perplexum, which had been recovered only from soils and not plant tissue, appeared non-pathogenic in all assays.

Item Type:Article
Business groups:Horticulture and Forestry Science
Keywords:Ginger rhizome; Host range; PSR; Pythium soft rot; Zingiber officinale
Subjects:Plant culture > Food crops
Plant pests and diseases
Plant pests and diseases > Plant pathology
Deposited On:08 Aug 2016 01:44
Last Modified:08 Aug 2016 01:44

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