Bacterial bark canker on English walnut
Loreti, S.; Gallelli, A.; Piecirillo, P.; Belisario, A.
Acta Horticulturae 705: 433-435
ISSN/ISBN: 0567-7572 DOI: 10.17660/actahortic.2005.705.62
The bacterial canker caused by Brenneria nigrifluens (syn. Erwinia nigrifluens) has been observed in several English walnut orchards located in the north, central and south of Italy. The disease attacked the bark of trunks and scaffold branches of young and mature trees. Commonly, symptoms consisted in dark brown to blackish roundish blotches from which a dark liquid oozed from late spring to fall. Early indication of canker formation was the development of sunken areas.