Xylella fastidiosa suspected on Nerium oleander in California (US)
In southern California (US), a bacterial leaf scorch of Nerium oleander has been observed. The suspected causal agent is Xylella fastidiosa (EPPO A1 quarantine pest) but Koch's postulates are still under verification. Further studies are necessary on this apparently new disease of oleander.
Sources
Grevus, M.E.; Henry, J.M.; Hartin, J.E.; Wilen, C.A. (1996) Bacterial leaf scorch of oleander: a new disease in southern California.
Abstract of a paper presented at the APS/MSA Joint Annual Meeting, Indianapolis (US), 1996-07-27/31.
Phytopathology, 86(11), Supplement, p S100.