Search results for "botryosphaeria dieback"
showing 4 items of 4 documents
Lasiolactols A and B Produced by the Grapevine Fungal Pathogen Lasiodiplodia mediterranea
2016
A strain of Lasiodiplodia mediterranea, a fungus associated with grapevine decline in Sicily, produced several metabolites in liquid medium. Two new dimeric c-lactols, lasiolactols A and B (1 and 2), were characterized as (2S*,3S*,4R*,5R*,20S*,30S*,40R*,50R*)-and (2R*,3S*,4R*,5R*,20R*,30S*,40R*,50R*)-(5-(4-hydroxymethyl-3,5-dimethyl-tetrahydrofuran- 2-yloxy)-2,4-dimethyl-tetrahydro-furan-3-yl]-methanols by IR, 1D-and 2D-NMR, and HR-ESI-MS. Other four metabolites were identified as botryosphaeriodiplodin, (5R)-5-hydroxylasiodiplodin, (-)-(1R, 2R)-jasmonic acid, and (-)-(3S, 4R, 5R)-4-hydroxymethyl-3,5-dimethyldihydro-2-furanone (3 - 6, resp.). The absolute configuration (R) at hydroxylated s…
Taxonomy, pathogenicity and phylogeny of fungi associated with Botryosphaeria dieback in Sicily
2015
Since the first report of “Botryosphaeria dieback” caused by Lasiodiplodia theobromae in 2008, other Botryosphaeriaceae were found associated with declining vines in grape-growing areas of Western and Central Sicily. In a recent study, Diplodia seriata, Lasiodiplodia sp., Neofusicoccum parvum and Neofusicoccum vitifusiforme were isolated from declining grapevines. In order to fulfill Koch’s postulates and verify any genetic variability among isolates, pathogenicity, morphological, molecular and phylogenetic analyses were performed. The pathogenicity of eighteen isolates was tested by inoculating 2-year-old rooted grapevine cuttings (cv. Inzolia) and evaluating vascular discoloration length …
Les maladies du bois de la vigne : recherches pour apporter des solutions de lutte aux Professionnels
2017
Les travaux réalisés sur deux maladies du bois de la vigne (esca, BDA) ont montré leur effet sur la récolte et la croissance de la pousse printanière qui était annulé deux années après l’apparition des symptômes. Ces maladies ont aussi conduit à des modifications des propriétés analytiques des moûts et des vins. Les vins issus de raisins collectés sur des ceps symptomatiques n’étaient pas toujours les plus dépréciés. Les études effectuées sur le cycle biologique ont permis de mettre au point des outils pour différencier les individus de deux espèces de Botryosphaeriaceae et des outils d’hybridation in situ qui permettront de les localiser précisément dans les tissus. Elles ont aussi identif…
Pathogenicity and possible biological control of fungi associated to Botryosphaeria dieback of grapevine in Western Sicily
2018
Botryosphaeria dieback is a widespread grapevine trunk disease caused by species of fungi within the family Botryosphaeriaceae. Symptoms of the disease include bud necrosis, leaf chlorosis, vascular discoloration of the wood, cankers and dieback. In 2013 typical symptoms of Botryosphaeria dieback was observed in Western Sicily and four species associated with the syndrome were isolated and identified as Diplodia seriata, Lasiodiplodia mediterranea, Neofusicoccum parvum and Neofusicoccum vitifusiforme. In order to fulfill Koch’s postulates, pathogenicity tests of eighteen isolates were performed on two-year grapevine cuttings of cv. Inzolia. Six months after inoculation all the Botryosphaeri…