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Observation on black dead arm in French vineyards Vitis vinifera L.
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Journal Article
Observation on black dead arm in French vineyards Vitis vinifera L.
2001
Overview
Black dead arm was first identified in French vineyards in 1999. It produces symptoms in the vine wood, causing decline and eventually death. Previously, this disease was confused with esca because of the similarity of the foliar symptoms. Two forms of black dead arm, a mild and a severe form, were observed in French vineyards on Cabernet Sauvignon and Sauvignon. Isolation from 23 vines collected from four vineyards located in three viticultural districts of Bordeaux showed that the main fungi associated with the brown streaks were Botryosphaeria obtusa, B. dothidea and Trichoderma spp.. Pathogenicity tests showed that B. obtusa and B. dothidea caused dark lesions on one-year-old canes. Therefore, these two fungi merit further study to determine their role in causing black dead arm
[La malattia del black dead arm e' stata identificata in Francia per la prima volta nel 1999. Essa produce sintomi nel legno della vite, determinando deperimento ed, eventualmente, la morte. In precedenza, questa malattia veniva confusa con il mal dell'esca a causa della somiglianza dei sintomi a carico delle foglie. Nei vigneti francesi sono state osservate due forme di questa malattia, una leggera e una grave, su Cabernet Sauvignon e Sauvignon. L'isolamento da 23 viti derivanti da quattro vigneti localizzati in tre zone viticole di Bordeaux ha messo in evidenza che i principali funghi associati con le striature brune erano Botryosphaeria obtusa, B. dothidea e Trichoderma spp.. I test di patogenicita' hanno dimostrato che B. obtusa e B. dothidea causavano lesioni scure sui tralci di un anno. Percio', questi due funghi meritano un ulteriore approfondimento, allo scopo di determinare il loro ruolo nel provocare la malattia del black dead harm]
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