Resumo em Inglês:

The physical properties, vectors, differential hosts and host range of the "vira-cabeça" virus, were compared with those of the following viruses : spotted wilt virus, tomato tip-blight virus, kromneck virus, "corcova" virus and the virus described by Azevedo (3). As a result of this comparison it is pointed out that these viruses are alike or at least closely related to each other.