Warning: The information in this archived item was not confirmed with the appropriate National Plant Protection Organization and is provided solely for informational purposes. Please use this information with caution.

Subject: Exotic fungi species found on cuttings of Viburnum opulus
Date posted: November 13, 2001
Source: USDA, APHIS, PPQ Boston
A species of the fungus Lewia and the fungus Leptosphaeria lonicerae, both of which are not known to occur in the US, have been found on cuttings of European highbush cranberry (Viburnum opulus) arriving in Boston. These species cause small cankers on the stems of V. opulus and produce very small fruiting bodies that erupt through the bark. Once inspectors in Boston became accustomed to looking for the fruiting bodies, 100% of stems were found to be infested. The fungi pose a potential threat to the analogous North American shrub Viburnum trilobum, as well as the numerous other native and ornamental Viburnum species.