Risk of oak infection is associated with its distance from ongoing outbreaks. While disease thresholds that increase risk from one level to another have been identified using biological data, these thresholds are only one indicator of many that dictate risk, so it alone cannot be considered conclusive. In general though, if you are approximately 1 km from an outbreak, you are considered to be in an “at risk” area, especially if you are downhill and/or east of an outbreak.
How close does an oak tree have to be from a P. ramorum-infected bay laurel to be considered at risk of infection?
