Defra

Phytophthora ramorum has now been found at 718 sites in England and Wales as well as a number of sites in Scotland, Northern Ireland and Channel Isles.This total includes some on established plants growing outside in soil. In addition to Rhododendron and Viburnum, there have now been findings on Pieris, Camellia, Syringa, Kalmia and single findings on a pot-grown Taxus baccata (Yew), Hamamelis virginiana (Wych hazel), Laurus nobilis (Bay laurel) and Leucothoe plants.

In addition, some tree species have been affected. These include a non-native American southern red oak (Quercus falcata), European Holm oak (Quercus ilex) and Turkey oak (Q.cerris). Findings have also been confirmed in native beech (Fagus sylvatica), Southern beech (Nothafagus oblique), horse chestnut (Aesculus hippocastanum), sweet chestnut (Castanea sativa) and winter’s bark (Drimys winterii). All these findings are associated with previous adjacent findings of the disease in rhododendron.