Outbreaks of Xanthomonas arboricola pv. corylina in Germany
The NPPO of Germany informed the EPPO Secretariat of recent outbreaks of Xanthomonas arboricola pv. corylina (EPPO A2 list) in Bayern and Baden-Württemberg. The EPPO Secretariat had previously no data on the occurrence of this disease in Germany. On the 24th of August and 15th of November 2005, the plant protection service of Bayern notified the occurrence of X. arboricola pv. corylina in 5 companies producing hazelnut fruits (Corylus avellana) and 1 case in natural environment. The affected companies had been supplied by another one in Baden-Württemberg, where the disease was also detected.
Affected plants showed symptoms of growth reduction and shoot wilting. The pathogen was identified by laboratory methods, such as physico-chemical tests and fatty acid analysis. Details on these investigations have been published by Poschenrieder & Theil (2004). The infected parts of the diseased plants have been removed.
Affected plants showed cankers. The infected lot was put under quarantine. In spring 2006, all lots of C. avellana from the company concerned will be tested for X. arboricola pv. corylina.
The origin of this infection is still being investigated.
The pest status of Xanthomonas arboricola pv. corylina in Germany is officially declared as follows: Transient: actionable.
NPPO of Germany, 2005-12.
Poschenrieder G, Theil S (2004) [First occurrence of plant pathogenic bacteria in hazelnut production in Bavaria]. Available on line http://www.phytomedizin.org/ak/11/tagung2004.htm