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Publicação
Doença de Petri da videira: avaliação da eficácia de fungicidas na protecção de feridas de poda
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Orientador(es)
Resumo(s)
Phaeomoniella (Pa.) chlamydospora and Phaeoacremonium spp. are responsible for
causing black measles (esca) and Petri disease of mature and young grapevines,
respectively. The economic importance of these diseases has increased dramatically
worldwide, thus explaining why they have long been the subject of intense research. In
this study, the pathogenicity of seven isolates of Pa. chlamydospora to Touriga Nacional
vines was confirmed, using two methods of inoculation, spore suspensions and mycelial
discs. The inoculation by mycelial discs was significantly more efficient, by the largest
size of the necroses produced and the highest percentage of reisolation. There were no
differences in virulence among isolates. The efficacy of fungicides in the protection of
pruning wounds was evaluated in the varieties Touriga Nacional and Syrah, using
carbendazim+flusilazole as reference. Among the parameters evaluated, the percentage
of reisolation and/or the detection of the pathogen by nested-PCR were those which
proved to be the most reliable. It was observed that the colonization of the vine occurred
mainly above and below the 3rd node. For the Syrah grape variety, two treatments
significantly reduced the percentage of reisolation of Pa. chlamydospora compared to the
control, but they did not differ from the reference fungicide. For Touriga Nacional, only
one treatment was comparable to the reference (carbendazim+flusilazol).
Descrição
Mestrado em Engenharia Agronómica - Instituto Superior de Agronomia
Palavras-chave
Vitis vinifera Petri disease Phaeomoniella chamydospora Phaeoacremonium spp. pathogenicity disease control patogenicidade meios de luta