Epiphytic Occurrence of Pseudomonas syringae pv. papulans (Rose) in France, Where Blister Spot has Never Been Seen |
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| Authors: | Mohamed Kerkoud Charles Manceau Louis Gardan Regine Samson Jean-Pierre Paulin |
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| Institution: | (1) Centre d'Angers, Unité de Pathologie Végétale et Phytobactériologie, INRA, 42 rue Georges Morel, BP 57, 49071 Beaucouzé cedex, France;(2) Centre d'Angers, Unité de Pathologie Végétale et Phytobactériologie, INRA, 42 rue Georges Morel, BP 57, 49071 Beaucouzé cedex, France; |
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| Abstract: | Pseudomonas syringae pv. papulans (PSP) the causal agent of blister spot, on the apple cultivar Mutsu in the USA, Canada and Italy, has not been described in France. A study on epiphytic populations of P. syringae isolated from French apple orchards revealed two isolates called KA54 and E121, whose biochemical characterisation showed high similarities with PSP strains. Identical symptoms were obtained with KA54, E121 and PSP strains, after vacuum inoculation of detached immature fruits of the cultivar Fuji, and young leaves of the cultivars Fuji, Mutsu, Gala and Golden Delicious. Koch's postulate was verified. These results indicate the presence of PSP in France. Differential characterisation criteria including serological, molecular and pathogenicity tests are proposed. |
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| Keywords: | apple pathogenicity serological characterisation physiological characterisation |
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