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Bacterial wilt of oxalis caused by Ralstonia solanacearum in Brazil.


Symptoms of bligth with subsequent drop of leaves as well as wilting and death of plants were observed in flower-beds with oxalis, in gardens of the city of São Paulo, State of São Paulo, Brazil. The vascular system of these plants were typically discolored. Microscopic examinations of the cut stems showed abundant bacterial streamings. Isolations on tetrazolium medium yielded pink and slimy colonies which, when inoculated onto healthy oxalis plants, reproduced the symptoms. The bacterium was reisolated from diseased tissues and biochemical, cultural and physiological tests confirmed the pathogen as R. solanacearum (sin. Pseudomonas solanacearum), biovar 1. Bacterial strain was deposited in IBSBF Culture Collection under accession number 1548.

ISSN: 2447-536X

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