What are its hosts?
A ‘host’ in biological terms is something which a pathogen can infect and colonise. Infected plants typically display symptoms of disease. In GB, shrub and tree species in 15 host genera are affected, representing 9 different families. The main shrub host affected is rhododendron. About 60 trees have exhibited bleeding cankers in GB, and these are mainly beech trees. Trees with foliar infections have been predominantly magnolias and Drimys. The first official report of P. kernoviae in New Zealand was on the orchard fruit tree known as cherimoya or custard apple. It has recently been discovered that an unidentified Phytophthora isolated from beneath stands of the conifer tree Pinus radiata in the 1950s in NZ is P. kernoviae. These trees exhibited no disease symptoms. The known hosts of P. kernoviae to date include Fagus sylvatica (beech), Rhododendron spp., Quercus robur (English oak), Quercus ilex (holm Oak), Gevuina avellana (Chilean hazelnut), Liriodendron tulipfera (tulip tree), Mag
