Pseudomonas avellanae

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symptoms of Pseudomonas avellanae infection on hazelnut, A + B) decline symptoms, C) discoloration of cambium on declining branch, D + E) trees killed by the disease (click on image to enlarge it)
Author(s): Jay Ram Lamichhane, Claudia Bartoli and Leonardo Varvaro
Source: PLoS ONE, 2016, 11 (2) e0147584

Pseudomonas avellanae (Psallidas) Janse et al. - (hazelnut decline)

The bacterium causes hazelnut decline in southern Europe. It has caused a large epidemic in Greece during the 1970s. A similar epidemic was reported from Italy around the same time. Both outbreaks were attributed to Pseudomonas syringae pv. avellanae which was renamed in 1996 to Pseudomonas avellanae.

Subsequent more detailed molecular studies revealed the presence of two different bacteria with an Italian form being assigned to the re-described Pseudomonas syringae pv. avellanae (Scortichini et al., 2016). However, a separate survey in central Italy during 2010-2012 found only the form Pseudomonas avellanae (Lamichhane et al., 2016).