Transmission of Pseudomonas syringae pv. pisi
In the UK, experiments were carried out to study the effect of soil moisture on the transmission of Pseudomonas syringae pv. pisi (EPPO A2 organism) from seedling to seedling.
The results of the controlled-environment experiments showed that soil moisture plays a considerable role in the transmission of pea bacterial blight from seedling to seedling. The author suggested that infection takes place during germination and emergence and that the embryo is not infected. They assumed that a later sowing date in drier seedbeds might reduce bacterial blight.
Sources
Roberts, S.J. (1992) Effect of soil moisture on the transmission of pea bacterial blight (Pseudomonas syringae pv. pisi) from seedling to seedling.
Plant Pathology 41, 136-140.EPPO