UC Cooperative Extension Ventura County
669 County Square Dr. Suite 100
Ventura CA 93003
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The name comes from the fact that the disease was first identified on olives. And it can be a serious disease on olives causing severe crop loss. The causal microorganism is a bacterium which survives in the galls. The bacterium becomes active during spring rains and is moved about by wind-blown rain, insects, and possibly birds. The bacterium infects the host through leaf and flower scars and through wounds.