Characteristics of South African Strains of Pseudomonas solanacearum

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Abstract
Forty-five strains of Pseudomonas solanacearum were isolated from host plants grown in different locations in South Africa. With one exception, the strains isolated from potatoes were identified as biotype II, and all but one of the strains from tomatoes and tobacco as biotype III. Distinct differences were found between the two biotypes with respect to their ability to oxidize eight carbohydrates dissolved in a synthetic medium. One strain from potatoes, identified as biotype II, was distinctly different from the other potato strains in its ability to oxidize the carbohydrates. Five strains were selected for virulence tests on eight host plants. All these strains were virulent to potatoes, tomatoes, eggplant, and pepper but there were clear differences in virulence towards tobacco, sunflower, peanut, and the weed large thorn apple (Datura ferox).

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