Identidade do virus de vira-cabeça e sua inclusão no grupo do virus do "spotted wilt"

Abstract

<abstract language="eng">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

Comportamento de variedades e progênies de fumo na resistência ao "vira-cabeça"

“…4) The analysis of disease resistance could follow the same lines only the case of the infection of Sumatra by "spotted wilt" (2). There the main percentage of infected plants per plot was 60%, and the individual percentagens, without any further angular or other transformation, were used.…”

Observações sôbre vira-cabeça em tomateiros

“…Este fato tem sido provado por numerosas experiências de inoculações cruzadas. Ensaios efetuados para determinação das propriedades físicas das estirpes isoladas mostraram que elas são idênticas àquelas das estirpes provenientes de fumo (7).…”

Search in Solanum (section Lycopersicon) germplasm for sources of broad-spectrum resistance to four Tospovirus species

“…Extensive surveys indicated that Groundnut ringspot virus (GRSV), TSWV, Tomato chlorotic spot virus (TCSV), and Chrysanthemum stem necrosis virus (CSNV) are the prevalent tomato-infecting tospoviruses in tropical and sub-tropical areas of South America (Pozzer et al 1996;Nagata et al 1998;Williams et al 2001;Giordano et al 2010). In Brazil, infection by Tospovirus species has been a continuous problem since the establishment of commercial fresh-market tomato cultivation in the beginning of the last century (Costa and Kiehl 1938;Costa and Forster 1941;Melo et al 2009). Yield losses in susceptible tomato cultivars might be as high as 95% under favorable environmental conditions such as those found in the near-equatorial Northeast region of Brazil (Giordano et al 2000).…”