Olive knot in Spain; caused by bacteria Pseudomonas savastanoi pv.savastanoi causing galls on twigs or branches at wounds. The bacteria live in the galls and ooze out in wet weather. They also live on the surface of leaves. Environmental conditions effect on the incidence and importance of the disease.
Frost damage and olive knot in Turkey. Photo from University of Canakkale Onsekiz Martity.
In Australia Olive knot was recorded in 2003 on 2- year- old olive cv.Barnea, but do not appear to be a widespread problem.