First Report of Phytophthora ramorum on Ornamental Plants in France

C. Husson (1) , C. Delatour (1) , Pascal Frey (1) , Benoit Marçais (1) , C. Saurat (2) , N. Schenck (2)

1 IAM - Interactions Arbres-Microorganismes
2 Unité de Mycologie Agricole et Forestière (LNPV-UMAF)

In April 2002, Phytophthora ramorum was associated with twig blight and brown spots on Rhododendron spp. leaves from a nursery in France. The isolate was identified by its morphological characters on V8 agar: slow growth, deciduous and semipapillate sporangia, and abundant production of large chlamydospores (3). The identification was confirmed by ITS rDNA sequencing. During 2002, P. ramorum was also isolated from diseased Viburnum tinus and V. × bodnantense plants exhibiting symptoms of wilting and stem base discoloration. Subsequently, repeated surveys for P. ramorum were carried out in nurseries and areas surrounding nurseries throughout France.

Mots clés: FUNGAL DISEASES; GEOGRAPHICAL DISTRIBUTION; NEW RECORDS; PLANT DISEASES; PLANT PATHOGENIC FUNGI; PHYTOPHTHORA CRYPTOGEA; PHYTOPHTHORA RAMORUM; PIERIS JAPONICA; VIBURNUM TINUS; VIBURNUM BODNANTENSE; CAMELIA

Mots clés: NURSERIES; ORNAMENTAL PLANTS

Domaines: Phytopathologie et phytopharmacie; Systématique, phylogénie et taxonomie

C. Husson, C. Delatour, Pascal Frey, Benoit Marçais, C. Saurat, et al.. First Report of Phytophthora ramorum on Ornamental Plants in France. Plant Disease, 2007, 91 (10), pp.1359. ⟨10.1094/PDIS-91-10-1359B⟩. ⟨hal-02089812⟩