Xylella fastidiosa can attack Quercus laevis and Q. incana
In 1992-1993, a survey on more than 200 oak trees confirmed the widespread occurrence of Xylella fastidiosa (EPPO A1 quarantine pest) in Florida (US). The bacterium was detected using ELISA in several oak species showing decline or symptoms of leaf scorch, and was also detected in a few cases in asymptomatic trees. The occurrence of X. fastidiosa in Quercus laevis and in Q. incana are reported for the first time. The pathogen was also found in Q. falcata, Q. virginiana, Q. laurifolia, and Q. nigra.
Barnard, E.L.; Ash, E.C.; Hopkins, D.L.; McGovern, R.J. (1998) Distribution of Xylella fastidiosa in oaks in Florida and its association with growth decline in Quercus laevis.
Plant Disease, 82(5), 569-572.