Distribution of Xylella fastidiosa in oaks in Florida and its association with growth decline in Quercus laevis.
During 1992, a survey of >200 oak trees in Florida, USA, showed that X. fastidiosa was widespread in oak populations. The pathogen was detected via ELISA in oaks exhibiting decline or leaf scorch symptoms, and was infrequently detected in asymptomatic trees. It was also associated with reduced growth in Q. laevis, as measured by current-year shoot length. The occurrence of X. fastidiosa in Q. laevis, and the evidence for its occurrence in Q. incana are thought to be the first reports of this pathogen on these hosts.