Occurrence of crown gall on grape was observed in a vineyard in Minas
Gerais State, Brazil. Isolations of the pathogen yielded a bacterium w
hich incited galls on grapevine, tomato and bryophillum. The bacterium
was confirmed as Agrobacterium tumefaciens and its characterization s
howed it to be biovar 3. This is the first report on the occurrence of
the biovar 3 of A. tumefaciens on grapevine in Brazil.