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Botryosphaeria species associated with diseases of grapevines in Portugal Vitis vinifera L.
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Journal Article
Botryosphaeria species associated with diseases of grapevines in Portugal Vitis vinifera L.
2002
Overview
Although Botryosphaeria species are known to cause cankers and dieback in many different woody hosts, their importance in grapevines has been largely ignored. Indeed, they are more often regarded as saprophytes or weak pathogens. In the work presented here the species of Botryosphaeria associated with wood and trunk diseases of grapevines in Portugal were determined. Three species, namely, B. obtusa, B. parva and B. lutea, were regularly associated with trunk dieback, wood necrosis, brown wood streaking, cane bleaching or incomplete grafts. Botryosphaeria parva was the most common and widely distributed species. Botryosphaeria dothidea and B. stevensii were less common; the former was found on bleached canes and on necrotic tissues at the graft union, while the latter was isolated from necrotic buds and, occasionally, from brown streaks in the wood. These data indicate that B. parva is associated with many of the symptoms normally linked with infection by other fungi in the grapevine decline syndrome. To stimulate further research on this genus, descriptions of the species associated with grapevines and an identification key are provided
[Sebbene sia noto che le specie di Botryosphaeria causano cancri e degenerazione in numerosi ospiti costituiti da piante legnose, la loro importanza nella vite e' stata ampiamente ignorata. In realta', esse sono considerate spesso come saprofite o come patogeni deboli. In questo lavoro sono state determinate le specie di Botryosphaeria associate alle malattie del legno e del tronco della vite in Portogallo. Tre specie, precisamente B. obtusa, B. parva e B. lutea, sono risultate associate comunemente con deperimento del fusto, necrosi del legno, striature brune del legno, decolorazione dei tralci o innesti incompleti. Botryosphaeria parva e' risultata la specie piu' comune e largamente diffusa. Botryosphaeria dothidea e B. stevensii erano meno frequenti; la prima e' stata trovata su tralci scoloriti e su tessuti necrotici in corrispondenza del punto di innesto, mentre la seconda e' stata isolata da gemme necrotiche e, occasionalmente, da striature brune nel legno. Questi dati indicano che B. parva e' associata a molti dei sintomi collegati normalmente all'infezione da parte di altri funghi nella malattia del deperimento della vite. Per stimolare ulteriori ricerche su questo genere, vengono fornite le descrizioni delle specie associate alla vite e una chiave per la loro identificazione]
