Journal of Phytopathology · 1996 · 29 citations · 11 references
AgriculturePlant BiologyPlant SciencesMicrobial GeneticsPlant Disease DiagnosisPlant GeneticsBacterial Disease SymptomsBacterial IdentificationBacterial Pathogenesis In PlantsBacterial Plant PathogensPathogen IsolationVegetable MicrobiologyOpen-field TestPathogen Race IdentificationPathogen Virulence TestingPlant Pathogen DetectionPlant Pathogen IdentificationPseudomonas SpeciesSpeck DiseaseVegetable Pathogenic Microbiology
Abstract Bacterial speck symptoms on leaves of the tomato cultivar Erminia Fl (Petoseed), heterozygous for the Pto resistant gene, were observed in June 1995 in Northern Italy. Using individual‐lesion isolation, 8 bacterial isolates were obtained from the affected leaves, which were identified as Pseudomonas syringae pv. tomato by biochemical, physiological, nutritional and pathogenicity tests. When the differential cultivar Ontario 7710, homozygous for the Pto gene, was inoculated with the bacterial isolates, 4 of them provoked the typical bacterial speck symptoms and therefore belonged to race 1. This is the first occurrence of P. syringae pv. tomato race 1 in Italy and the first time this race has been isolated on a Pto gene‐bearing tomato cultivar grown in open field.
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