Investigations on a vein banding disease of grapevine in Sardinia

• Published in: Phytopathologia mediterranea 1985-08, Vol.24 (1-2), p.24-28
• Main Authors: Prota, U, Garau, R, Cugusi, M, Dore, M. (Sassari Univ. (Italy). Istituto di Patologia Vegetale)
• Format: Article
• Language: English
• Subjects: Disease transmission; Graftage; GRAPEVINES; Plant diseases; Plant veins; PLANT VIRUSES; Plants; SARDAIGNE; SARDINIA; Symptoms; Vascular diseases; VID; VIGNE; Vineyards; Viral diseases; VIROLOGIA; VIROLOGIE; VIROLOGY; VIRUS DE LAS PLANTAS; VIRUS DES VEGETAUX; Viruses
• ISSN: 0031-9465; 1593-2095

A leaf disorder akin to vein banding disease occurs in Sardinia in all areas where cv. Cannonau is cultivated. It may reach, in some vineyards, an incidence higher than 25%. The symptoms, which sometimes are very severe, are erratically shown. Selfrooted and grafted (on virus-free rootstocks) vines propagated from plants that were symptomless in the place of origin, developed symptoms when grown in other localities, though in an inconsistent manner. The field symptomatology was reproduced, again erratically, on woody indicators ('Mission' and LN 33) during indexing for sanitary selection. 'Mission' was more sensitive than LN 33 although some negative responses were obtained using material from symptomatic vines. The inconsistency of symptom expression does not seem to depend on the different enviromental conditions under which the vines are grown. In twelve varieties other than 'Cannonau', the disease was present in latent form, as shown by response of woody indicators. No consistent association was found between vein banding-like symptoms and presence of Grapevine fanleaf virus in any of the varieties under study, including 'Cannonau'. This prompts us to speculate that the vein banding-like condition observed in Sardinia may result from the interaction of different factors, among which the one involved in the genesis of Australian yellow speckle, which is considered to be widespread in the world. Further studies are in progess but it appears that international cooperation would represent a most sensible approach for the etiological definition of this and similar diseases. Alterazioni fogliari simili alla scolorazione perinervale (vein banding) sono frequenti in Sardegna in tutte le aree dove è coltivata la cv. Cannonau. In alcuni vigneti le piante affette possono raggiungere un'incidenza del 25%. I sintomi, talvolta molto gravi, sono peraltro piuttosto incostanti. Viti autoradicate e ottenute per innesto su soggetti virus-esenti attraverso materiale di propagazione di piante senza sintomi nelle località di origine, hanno mostrato sintomi in altre località ancorché in maniera incostante. La sintomatologia di campo è stata riprodotta, anche in questo caso in maniera incostante, su indicatori legnosi ('Mission' e LN 33) durante il lavoro di selezione sanitaria. 'Mission' è risultata più sensibile di LN 33, anche se risposte negative sono state ottenute usando materiale di piante mostranti sintomi. L'incostanza dell'espressione sintomatologica non sembra dipe