Agrobacterium tumefaciens
The pathovar of greatest economical significance is "Pseudomonas savastanoi" pv. "savastanoi", which causes the disease olive knot. Symptoms include formation of galls on infected trees; tumour formation is induced by indoleacetic acid biosynthesis by the bacteria, in a similar manner to the well-studied crown gall pathogen, "Agrobacterium tumefaciens".