Pseudomonas syringae pv. actinidiae, three years after its discovery in New Zealand: what have we learned about the pathogen, the disease and how to control it?

In the last few years the causal agent of bacterial canker of kiwifruit, Pseudomonas syringae pv. actinidiae (Psa), has become a global pathogen of economic importance. Before 2008, this little known