Strains of Pseudomonas solanacearum Affecting Solanaceae in the Americas. Carlos Martin, Pathology Department, International Potato Center, Apartado 5969, Lima, Peru. E. R. French, and Ursula Nydegger, Pathology Department, International Potato Center, Apartado 5969, Lima, Peru. Plant Dis. 66:458-460. Accepted for publication 24 July 1981. Copyright 1982 American Phytopathological Society. DOI: 10.1094/PD-66-458.

Of 85 strains of Pseudomonas solanacearum from 10 countries in the Americas and from four solanaceous hosts, 28 strains were biotype I, 52 were biotype II, and 5 were biotype III. Biotype I was identified among strains from Brazil, Colombia, Costa Rica, Peru, and the USA. Biotype III was found among strains from Costa Rica, Peru, and Brazil only; but none of the strains were from potatoes. Biotype IV was not found. Thirty representative strains were selected for pathogenicity tests on tomato (Lycopersicon esculentum ‘Huando’), potato (Solanum tuberosum ‘Ticahuasi’), and Nicotiana glutinosa. Twenty-three strains were pathogenic on all three hosts, by a soil infestation method. Biotype II had more pathogenic strains than biotype I under glasshouse conditions. Only one strain of biotype III, from tomato, affected potatoes.

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