Abstract
Occurrence of <i>Phytophthora ramorum</i> on <i>Rhododendron, Vaccinium, Viburnum</i> and <i>Quercus</i> species in ornamental nurseris and fores stands in 2001-2002 and necrosis spead on plant parts and seedlings wewe studied. Only <i>P. citricola</i> was isolated from <i>Rhododendron</i> spp. and <i>V.vitis-idaea</i>. Shoot necrosis and dieback symptoms were not observed on <i>Viburnum</i> species in surveyed nurseries. From diseased Quercus</i> trunks among others <i>Armillaria</i> spp. and <i>Fusarium</i> spp. were isolated. Inoculation of leaves and stem parts of <i>Rhododendron</i> cultivars and other ericaceous plants with P. ramorum resulted in the development of leaf and stem rot. The species caused stem necrosis of <i>Fagus sylvatica, Q. rubra</i> and <i>Pseudotsuga</i> menziesii but symptoms developed slowly.
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