Phlomobacter fragariae
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top right: strawberry plants infected with Candidatus Phlomobacter fragariae - white box = typical symptoms of small, cup-shaped leaves with yellow chlorosis along the leaf margins - remaining: EM images of Phlomobacter bacteria in phloem sieve elements of strawberry stolons (click on image to enlarge it)
Authors: Jessica Dittmer et al.
Source: insects (2021), art. 93
Authors: Jessica Dittmer et al.
Source: insects (2021), art. 93
Candidatus Phlomobacter fragariae Zreik et al. 1998
This bacterium causes marginal chlorosis of strawberry and is a phloem restricting pathogen in the Arsenophonus clade from group 3 of the gamma subclass of Proteobacteria. The disease has been reported from France since the 1980s and has been also reported from Italy and Japan (e.g. see Tanaka et al., 2006). The typical symptoms are small, cup-shaped leaves with yellow chlorosis along the leaf margins.
The disease can be transmitted through plant stolons and through the planthopper Cixius wagneri. In fact bacteria of the Arsenophonus clade are typically insect endosymbionts (Dittmer et al., 2021).
