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Pythiogeton ramosum, a new pathogen of soft rot disease of ginger (Zingiber officinale) at high temperatures in Australia

Le, Duy P. and Smith, Mike K. and Aitken, Elizabeth A. B. (2015) Pythiogeton ramosum, a new pathogen of soft rot disease of ginger (Zingiber officinale) at high temperatures in Australia. Crop Protection, 77 . pp. 9-17.

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Article Link(s): http://dx.doi.org/10.1016/j.cropro.2015.07.012

Publisher URL: http://www.sciencedirect.com/science/article/pii/S0261219415300673

Abstract

Pythium soft rot (PSR) of ginger caused by a number of Pythium species is of the most concern worldwide. In Australia, PSR outbreaks associated with Pythium myriotylum was recorded in 2007. Our recent pathogenicity tests in Petri dishes conducted on ginger rhizomes and pot trials on ginger plants showed that Pythiogeton (Py.) ramosum, an uncommon studied oomycete in Pythiaceae, was also pathogenic to ginger at high temperature (30–35 °C). Ginger sticks excised from the rhizomes were colonised by Py. ramosum which caused soft rot and browning lesions. Ginger plants inoculated with Py. ramosum showed initial symptoms of wilting and leave yellowing, which were indistinguishable from those of Pythium soft rot of ginger, at 10 days after inoculation. In addition, morphological and phylogenetic studies indicated that isolates of Py. ramosum were quite variable and our isolates obtained from soft rot ginger were divided into two groups based on these variations. This is also for the first time Py. ramosum is reported as a pathogen on ginger at high temperatures.

Item Type:Article
Business groups:Horticulture and Forestry Science
Keywords:Pythiaceae Zoospores Narrow hyphae Isolation Cultivation Host range
Subjects:Agriculture > Agriculture (General) > Agricultural meteorology. Crops and climate
Agriculture > Agriculture (General) > Methods and systems of culture. Cropping systems
Plant culture > Food crops
Plant pests and diseases > Plant pathology
Deposited On:31 Aug 2015 04:33
Last Modified:31 Aug 2015 04:33

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