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Title:   Author  item
                                            TRAVADON, R. - University Of Californiaitem
                                            LECOMTE, P. - University Of Bordeauxitem
                                            DIARRA, P. - University Of Bordeauxitem
                                            LAWRENCE, D.P. - University Of Californiaitem
                                            VALLANCE, J. - Bordeaux Agro Sciencesitem
                                            OJEDA, H. - Institut National De La Recherche Agronomique (INRA)item
                                            REY, P. - Bordeaux Agro Sciencesitem
                                            Baumgartner, Kendra
  Submitted to: American Phytopathological Society Abstracts
                                    Publication Type: Abstract Only
                                    Publication Acceptance Date: 5/15/2015
                                    Publication  Date: 11/1/2015
                                    Citation: Travadon, R., Lecomte, P., Diarra, P., Lawrence, D., Vallance, J., Ojeda, H., Rey, P., Baumgartner, K. 2015. Influence of pruning systems on trunk pathogens and other fungi colonizing grapevine wood. American Phytopathological Society Abstracts. 68-O.Interpretive Summary:
                                Technical Abstract: The main infection courts for fungal grapevine trunk pathogens are pruning wounds. Disease control typically involves modifications to pruning. Pruning practices requiring fewer/smaller wounds may thus be associated with fewer trunk pathogens and less wood necroses. We examined wood-colonizing fungi in the trunks of asymptomatic, 14-year-old vines (Vitis vinifera ‘Mourvèdre’ at site A, ‘Syrah’ at site B), either spur-pruned or minimally (min-) pruned. At each site, the trunks of eight min-pruned and eight spur-pruned vines were characterized in terms of necrotic wood and the community structure of the 88 cultivable fungal taxa identified through ITS sequencing. Spur-pruned vines had more wood necroses (35% vs. 20% in min-pruned vines) and a greater diversity of taxa, but not a greater abundance of trunk pathogens. Instead, Canonical Correspondence Analysis revealed different trunk pathogens: Diaporthe ampelina and Togninia minima were associated with spur pruning, and D. foeniculina, Neofusicoccum parvum, and Phaeomoniella chlamydospora with min-pruning. Among the 15 most abundant taxa, eight were more common in spur-pruned vines (e.g., wood endophytes Aureobasidium pullulans, Bionectria ochroleuca), compared to only five in min-pruned vines (e.g., Paraconiothyrium brasiliense, Pestalotiopsis microspora). Spur-pruned vines were associated with more plant pathogenic taxa, which may contribute to greater levels of wood necrosis.

Both sites were affected by esca disease: out of 74 vines surveyed per cultivar, percentages of wood and leaf symptomatic vines of Mourvèdre were 32% and 12% for spur-pruned vines and min-pruned vines respectively, those of Syrah were 46% and 16% for spur-pruned vines and min-pruned vines respectively.


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