Pseudomonas syringae van Hall, 1904

on Rosmarinus

Pseudomonas cf syringae on Rosmarinus officinalis

Rosmarinus officinalis, Belgium, prov. East Flanders, De Pinte © Dirk Duytschaever. The shrub is growing already for several years in the garden of the photographer.

Pseudomonas cf syringae on Rosmarinus officinalis

the malignant growth erupts through the bark

notes

This gall seemingly is not mentioned in the European gall literature. The only indication that I could find was a photo on the website of the Missouri Botanical Garden, where P. syringae is mentioned as the possible causer.

hostplants

Lamaceae

Rosmarinus officinalis.

mod 16.x.2017