First report of witches’ broom and dieback of Tabebuia rosea (TrWB) in Belo Horizonte, Minas Gerais, Brazil
DOI:
https://doi.org/10.5380/revsbau.v20.99089Resumo
Tabebuia rosea is an exotic tree species widely used in Brazilian urban forests. The occurrence of overgrowth of mature branches, dwarfism and decline was noted in young and adult specimens of T. rosea found among street trees in the city of Belo Horizonte, MG state. This study reports reports on the identification of the causal agent of this disease and presents perspectives for the management, prevention and control of witches' broom of T. rosea in urban forest. Stem cuttings from symptomatic and asymptomatic trees were collected from public areas (streets and squares) in Belo Horizonte (MG) and subjected to Scanning Electron Microscopy (MEV) and nested-PCR tests to detect phytoplasmas. It was concluded that Candidatus Phytoplasma sp. is the etiological agent associated with T. rosea witches' broom (TrWB). It is proposed that integrated management measures to be adopted, such as restricting the planting of T. rosea seedlings in urban forests, inspecting forest nurseries to avoid using contaminated propagating material, establishing quarantine measures and eliminating diseased or symptomatic plants. New studies should be carried out with a view to identifying the species of insect vector of TrWB and aiming to obtain additional information on the distribution of this phytoplasmose in the municipality. The development of field tests for the detecting the TrWB-infected plants is a priority in order to avoid the spread of contaminated propagating material.
Keywords: Disease; Ornamental tree; Ipê-rosa; Phytoplasma.
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