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Phytopathologia Mediterranea (2014) 53, 124-129

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Adel K. Madbouly, Einas H. El-Shatoury and Mohamed A. Abouzeid (2014)
Etiology of stipe necrosis of cultivated mushrooms (Agaricus bisporus) in Egypt
Phytopathologia Mediterranea 53 (1), 124-129
Abstract: Internal stipe necrosis of cultivated button mushrooms (Agaricus bisporus) is caused by the bacterium Ewingella americana (Enterobacteriaceae), which is part of the endogenous bacterial population in mushroom sporocarp tissues. Isolation of the causal agent of stipe necrosis led to the recovery of three bacterial morphotypes. Ewingella americana was isolated from 90% of mushroom samples showing mild stipe browning, while Pseudomonas fluorescens and P. tolaasii were also isolated. Inoculation with E. americana into button mushroom sporocarps yielded typical browning symptoms which were distinguishable from those of the bacterial soft rot. This bacterium was re-isolated and its identification was verified, thus fulfilling Koch's postulates. However, inoculations with P. fluorescens and P. tolaasii caused no stipe browning. The strain identities were verified by biochemical identification and through analysis of their 16S rRNA gene sequences. This study has outlined the etiology of stipe necrosis of cultivated button mushroom in Egypt, and is the first report of E. americana in this country.
(The abstract is excluded from the Creative Commons licence and has been copied with permission by the publisher.)
Link to article at publishers website


Research topic(s) for pests/diseases/weeds:
general biology - morphology - evolution


Pest and/or beneficial records:

Beneficial Pest/Disease/Weed Crop/Product Country Quarant.


Pseudomonas fluorescens Egypt
Pseudomonas tolaasii Egypt
Ewingella americana Agaricus (crop) Egypt