Pacific Southwest

Title: Comparative host range and aggressiveness of Phytophthora ramorum and Phytophthora kernoviae sp. nov. on North American and European trees

Author: Brasier, Clive; Rose, Joan; Kirk, Susan; Denman, Sandra; Webber, Joan

Date: 2006

Source: In: Frankel, Susan J.; Shea, Patrick J.; and Haverty, Michael I., tech. coords. Proceedings of the sudden oak death second science symposium: the state of our knowledge. Gen. Tech. Rep. PSW-GTR-196. Albany, CA: Pacific Southwest Research Station, Forest Service, U.S. Department of Agriculture: 109-111

Station ID: GTR-PSW-196

Description: Phytophthora ramorum and P. kernoviae are recently introduced, invasive pathogens in woodlands in southern Britain. P. kernoviae, previously known as Phytophthora taxon C, is a newly discovered taxon, (Brasier and others 2005), found during surveys for P. ramorum in Cornwall, southwest England in November 2003. Both species are aggressive pathogens on foliage and shoots of understory rhododendron, especially R. ponticum. From this infection base they can spread aerially to attack the inner bark of tree stems, especially European beech (Fagus sylvatica) and some Quercus species, causing bleeding lesions. (Brasier and others 2004). To date P. kernoviae has been found causing bleeding lesions on about 50 mature F. sylvatica trees, two common European oaks, Quercus robur, and a Liriodendron at several adjacent woodland sites. The wider international risk to trees that P. kernoviae poses is unknown. The comparative host range and aggressiveness of P. kernoviae and P. ramorum to bark and foliage of North American and European tree species is therefore being investigated.

Keywords: host range, Phytophthora kernoviae, Phytophthora ramorum, susceptibility

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Citation

Brasier, Clive; Rose, Joan; Kirk, Susan; Denman, Sandra; Webber, Joan  2006.  Comparative host range and aggressiveness of Phytophthora ramorum and Phytophthora kernoviae sp. nov. on North American and European trees.   In: Frankel, Susan J.; Shea, Patrick J.; and Haverty, Michael I., tech. coords. Proceedings of the sudden oak death second science symposium: the state of our knowledge. Gen. Tech. Rep. PSW-GTR-196. Albany, CA: Pacific Southwest Research Station, Forest Service, U.S. Department of Agriculture: 109-111.