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Title:   Author  item
                                            TRAVADON, RENAUD - University Of Californiaitem
                                            ROLSHAUSEN, PHILIPPE - University Of Californiaitem
                                            GUBLER, W - University Of Californiaitem
                                            Cadle-Davidson, Lanceitem
                                            Baumgartner, Kendra
  Submitted to: Plant Disease
                                    Publication Type: Peer Reviewed Journal
                                    Publication Acceptance Date: 6/15/2013
                                    Publication  Date: 12/1/2013
                                    Publication URL: http://apsjournals.apsnet.org/doi/pdf/10.1094/PDIS-05-13-0525-RECitation: Travadon, R., Rolshausen, P.E., Gubler, W.D., Cadle Davidson, L.E., Baumgartner, K. 2013. Susceptibility of cultivated and wild Vitis to wood infection by fungal trunk pathogens. Plant Disease. 97:1529-1536.Interpretive Summary: Trunk diseases of grapevine cause variable levels of leaf symptoms, depending on the grapevine cultivar. However, little is known regarding cultivar susceptibility of their woody tissues to canker formation. Accordingly, we evaluated the relative susceptibility of grapevine cultivars (‘Cabernet Franc’, ‘Cabernet Sauvignon’, ‘Chardonnay’, ‘Merlot’, ‘Riesling’, ‘Petite Syrah’, and ‘Thompson Seedless’) and species or interspecific hybrids of North American Vitis [Vitis hybrid ‘Concord’, V. arizonica ‘b42-26’, V. rupestris ' V. cinerea ‘Ill547-1’, and Fennell 6 (V. aestivalis) ' Malaga (V. vinifera) ‘DVIT0166’] to canker formation by four trunk diseases (Eutypa dieback, Botryosphaeria dieback, Esca, Phomopsis dieback). Susceptibility was based on the length of wood discoloration (LWD) in the woody stems of plants in greenhouse experiments. Cultivars did not vary significantly in susceptibility to Botryosphaeria dieback or Esca. The table-grape cultivar Thompson Seedless was most susceptible to P. viticola (mean LWD of 61 mm at 11 months post-inoculation; P < 0.0001). Susceptibility to Eutypa dieback was greatest in American species V. arizonica b42-26 (mean LWD of 96 mm at 11 months post-inoculation; P < 0.03). In fact, all four American Vitis spp. were more susceptible to Eutypa dieback than the V. vinifera cultivars. Our findings suggest that no one cultivar is likely to provide resistance to the range of trunk pathogens, but that certain cultivars may be promising candidates for commercially-relevant host resistance in grape-production systems where the dominant cultivars are very susceptible.
                                Technical Abstract: Cultivars of European grapevine, Vitis vinifera, show varying levels of susceptibility to Eutypa dieback and Esca, in terms of foliar symptoms. However, little is known regarding cultivar susceptibility of their woody tissues to canker formation. Accordingly, we evaluated the relative susceptibility of V. vinifera cultivars (‘Cabernet Franc’, ‘Cabernet Sauvignon’, ‘Chardonnay’, ‘Merlot’, ‘Riesling’, ‘Petite Syrah’, and ‘Thompson Seedless’) and species or interspecific hybrids of North American Vitis [Vitis hybrid ‘Concord’, V. arizonica ‘b42-26’, V. rupestris ' V. cinerea ‘Ill547-1’, and Fennell 6 (V. aestivalis) ' Malaga (V. vinifera) ‘DVIT0166’] to canker formation by seven trunk pathogens (Neofusicoccum parvum, Lasiodiplodia theobromae, Phaeomoniella chlamydospora, Togninia minima, Phomopsis viticola, Eutypa lata, and an undescribed Eutypa sp.). Susceptibility was based on the length of wood discoloration (LWD) in the woody stems of rooted plants in duplicate greenhouse experiments. Cultivars of V. vinifera and Concord did not vary significantly in susceptibility to N. parvum or L. theobromae (LWD ranging from 21 to 88 mm at 14 weeks post-inoculation; P > 0.16), suggesting that they are similarly susceptible to Botryosphaeria dieback. The table-grape cultivar Thompson Seedless was most susceptible to P. viticola (mean LWD of 61 mm at 11 months post-inoculation; P < 0.0001). V. vinifera cultivars and Concord showed similar susceptibility to the Esca pathogens, P. chlamydospora and Togninia minima. Susceptibility to E. lata was greatest in V. arizonica b42-26 (mean LWD of 96 mm at 11 months post-inoculation; P < 0.03). In fact, all four American Vitis spp. were more susceptible to Eutypa dieback than the V. vinifera cultivars. Our findings suggest that no one cultivar is likely to provide resistance to the range of trunk pathogens, but that certain cultivars may be promising candidates for commercially-relevant host resistance in grape-production systems where the dominant cultivars are very susceptible.


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