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First Report of Fusarium Wilt Caused by Fusarium oxysporum f. sp. basilici on O...
Felgueiras, Mafalda; Dias, Alberto Carlos Pires; Chicau, Gisela; Leon, M.; Armengol, J.Ocimum minimum L. (fine-leaved basil) is cultivated along the Douro Litoral Region in Portugal. In June 2009, a disease was observed in fine-leaved basil fields in three geographically separated locations: Maia, Rio Tinto, and São Mamede Infesta. Affected plants showed wilt symptoms, chlorotic leaves, and stem necrosis. Discolored vascular tissue was observed when the stems were cut longitudinally. For isolatio...
Isolation and identification of fungi associated with Esca in Vinho Verde regio...
Felgueiras, Mafalda; Chicau, Gisela; Dias, Alberto Carlos PiresIn the Portuguese Vinho Verde region (RDVV), during the last years the esca incidence is taking serious proportions. In this context, in the summers of 2004 and 2005 three vineyards were selected (two within the Monção subregion and one outside) in order to isolate associated Esca-fungi. Cordons were taken from 10 infected Alvarinho cultivar grapevines showing esca foliar symptomatology. Results confirm the occ...
Differential phenolic production of Vitis vinifera cv. Alvarinho leaves affecte...
Lima, M. R. M.; Felgueiras, Mafalda; Cunha, Ana; Chicau, Gisela; Dias, Alberto Carlos PiresEsca is a destructive disease that affects Vitis vinifera around the world leading to important losses in wine production. Information on the response of Vitis vinifera plants to this disease is still scarce. To study the defence mechanisms of Vitis plants to Esca, we analysed leaves from both infected and non-affected boughs of Vitis vinifera cv. Alvarinho, of the Vinho Verde region (North of Portugal). Phenol...
Effects of Esca disease on leaf gas exchange of cv. Alvarinho in a vineyard of ...
Felgueiras, Mafalda; Chicau, Gisela; Pereira, José Moutinho; Dias, Alberto Carlos PiresEsca is a very complex disease that is usually noticed when the grapevine show external symptoms. However, the grapevines can be infected for a long period of time and rarely manifest the typical leaf symptoms. Moreover, little is know about the consequences of Esca on vineyard productivity. In Portugal, in Vinho Verde region, Alvarinho sub-region, most vineyards are infected with Esca. In this work we evaluate...
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