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Early season symptoms of stem, inflorescences and flowers of grapevine associated with Botryosphaeriaceae species
Publication . Reis, Pedro; Gaspar, Ana; Alves, Artur; Fontaine, Florence; Lourenço, Inês; Saramago, José; Mota, Mariana; Rego, Cecília
Botryosphaeria dieback caused by several Botryosphaeriaceae species is one of the most
important grapevine trunk diseases a ecting vineyards worldwide. These fungi cause wedge-shaped
perennial cankers and black streaking of the wood and have also been associated with intervein
leaf chlorosis, dried or mummified berries, and eventually, the death of the plant. Early season
symptoms may sometimes be disregarded by growers, being mistaken with symptoms from other
diseases such as downy mildew or botrytis rot. Currently, few studies are available to determine
what species may be causing these early season symptoms in grapevines. During the 2018 season,
during the flowering period, grapevine samples showing necrosis on green shoots, dried inflorescences,
and flowers, were collected in vineyards throughout the central regions of Portugal. Isolations were
performed from symptomatic organs, and twenty-three isolates of Botryosphaeriaceae were selected.
An analysis of the ITS and part of the translation elongation factor 1- sequences was performed,
revealing that the two main species apparently responsible for these symptoms were Diplodia seriata
and Neofusicoccum parvum. In pathogenicity tests conducted on 1-year-old plants grown under
controlled conditions in a greenhouse and on field-grown clusters, symptoms were reproduced,
confirming the pathogenic behavior of the selection of isolates
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Fundação para a Ciência e a Tecnologia
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9471 - RIDTI
Número da atribuição
PTDC/AGR-PRO/2183/2014