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Bacterial brown spot disease of bush bean phaseolus vulgaris in germany incited by pseudomonas syringae var phaseoli



Bacterial brown spot disease of bush bean phaseolus vulgaris in germany incited by pseudomonas syringae var phaseoli



Zeitschrift fuer Pflanzenkrankheiten und Pflanzenschutz 86(2): 75-85



The occurrence of bacterial brown spot disease of bush bean caused by P. syringae, is reported for the 1st time in Germany. The most conspicuous symptoms were large necrotic leaf spots and, less prevalent, bending or twisting of pods. Inoculation with the isolated bacteria produced typical symptoms on greenhouse grown bean plants and spread the disease in the field. Field occurrence of the disease was dependent upon weather conditions. Diseased plants often recovered completely. To differentiate from P. phaseolicola (= P. syringae s.l.), the designation P. syringae s.s. is used. Inoculation experiments with virulent isolates of P. syringae s.s. from other hosts on bean, at reasonable bacterial concentrations, did not result in typical disease symptoms. The bean pathogenic strains of P. syringae s.s. are, therefore, designated as pathovar phaseoli, and the starting points of field infections are believed to be contaminated bean seed.

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Accession: 004807851

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