Olive knot galls, caused by the bacterium Pseudomonas savastanoi pv. savastanoi (Psv), form on twigs of olive at sites of infection.
Olive knot galls, caused by the bacterium Pseudomonas savastanoi pv. savastanoi (Psv), form on twigs of olive at sites of infection. Credit: Elizabeth J. Fichtner
