European Journal of Plant Pathology (2016) 145, 265-276

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Artur Mikicinski, Piotr Sobiczewski, Joanna Pulawska and Robert Maciorowski (2016)
Control of fire blight (Erwinia amylovora) by a novel strain 49M of Pseudomonas graminis from the phyllosphere of apple (Malus spp.)
European Journal of Plant Pathology 145 (2), 265-276
Abstract: A bacterial isolate called 49M, showing protective activity against fire blight caused by the bacterium Erwinia amylovora, was selected from a large collection of isolates obtained from the apple phyllosphere and was identified as Pseudomonas graminis, based on its phenotype and sequence analysis of the 16S rRNA and rpoD genes. The efficacy of strain 49M under laboratory and greenhouse conditions to protect apple blossoms and apple terminal shoots was equal or even higher than that of the reference strains A506 of Pseudomonas fluorescens and C9-1 of Pantoea vagans, as well as the bioproducts BlightBan A506, Blossom Protect and Hortocyna 18 SP (streptomycin), used for comparison. However, its activity on pear fruitlets was slightly less effective, but significantly better (over 10 %) than that of BlightBan A506. When strain 49M was introduced onto apple blossoms in orchards, it effectively colonised them during the entire bloom period, in different weather conditions, including rain. The strain showed no pathogenicity towards plant tissue (pear fruitlets, apple blossoms, tobacco leaves) and is therefore, a potential candidate for the development of a new biopesticide against fire blight.
(The abstract is excluded from the Creative Commons licence and has been copied with permission by the publisher.)
Full text of article
Database assignments for author(s): Joanna Pulawska

Research topic(s) for pests/diseases/weeds:
biocontrol - natural enemies
Research topic(s) for beneficials or antagonists:
evaluation - screening - selection
general biology - morphology - evolution


Pest and/or beneficial records:

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


Erwinia amylovora Apple (Malus) Poland
Pseudomonas graminis (antagonist) Erwinia amylovora Apple (Malus) Poland