Identification of Phytophthora Species Causing Nine Floral Plants Blight in Guangzhou Region

Phytophthora isolates were obtalned from 9 species of diseased floral plants Rosa chinensis Jacq. , Rhododendron spp. L., Cattleya bowringiana Hort., Dianthus caryophyllus L., Calceolaria crenatiflora Cav., Catharanthus roseus (L. ) G. Don, Euphorbia pulcherrima Willd. ex Klotzsch, Lilium spp. L. and Spathiphyllum pallas Hort. collected in Guangzhou region. On the basis of the sexual and asexual characteristics of their single-spore cultures combined with the cardinal temperatures and the eletrophoresis of their proteins patterns, they were identified as: P. citricola Sawada (on Rosa chinensis), P. citrophthora (R. E. Smith & E. H. Smith) Leonian (on Rhododendron spp. ), P. Palmivora (Butler) Butler (on Cattleya bowringiana and Dianthus caryophyllus), and P. nicotianae Breda de Haan (on Calceolaria crenatiflora, Catharanthus roseus, Euphorbia pulcherrima, Lilium spp. and Spathiphyllum pallas ).