First report of Xylella fastidiosa on Quercus virginiana
Bacterial leaf scorch, caused by Xylella fastidiosa sensu lato (EPPO A1 quarantine pest) has been reported in Quercus falcata, Q. laurifolia and Q. nigra in Florida (US) in 1988. In autumn 1992, decline, marginal leaf necrosis and branch dieback were observed on Q. virginiana in southwest Florida and Xylella fastidiosa was isolated from the diseased trees. In autumn 1993, other symptomatic Q. virginiana trees were found and tested positive for X. fastidiosa by ELISA and PCR. This is the first report of X. fastidiosa on Q. virginiana. Note that EPPO is mainly concerned by this disease on grapevine and peach. The quarantine risk of X. fastidiosa on other hosts has to be further evaluated, as these hosts may present a certain risk.
Sources
McGovern, R.J. (1994) Association of Xylella fastidiosa with leaf scorch and decline of live oak in Florida.
Plant Disease, 78 (9), p 924.