Refining the biological factors affecting virulence of Botryosphaeriaceae on grapevines

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Botryosphaeriaceae isolates of six species were assessed for their potentialto infect grapevine tissues other than their tissues of isolation, primarily todetermine sources of inocula that could contribute to bunch rot. Pathogenicitytests were conducted in vitro on berries and wood and in vivo on dormantbuds of cultivars Chardonnay and Shiraz in glasshouse and field experiments.Tissue specificity and variation in virulence for different isolates was assessed.All isolates were able to infect and cause symptoms on detached 1-year-oldcanes and mature berries. Virulence was not affected by origin tissue and variedbetween isolates and within species. Inoculation of dormant buds did not affectbud burst or further development of shoots and fruit, however, a small numberof Botryosphaeriaceae were reisolated from bunches at later growth stages.We conclude that Botryosphaeriaceae species are important pathogens of boththe vegetative tissues and wood of grapevines. Grapevine wood infected withBotryosphaeriaceae could act as a source of inoculum for reproductive andvegetative tissue. Equally, the vegetative and reproductive tissues can alsoact as inoculum sources for wood infection. Therefore, all sources of inoculashould be taken into consideration when developing management strategiesfor Botryosphaeria bunch rot and Botryosphaeria canker diseases.
Original languageEnglish
Pages (from-to)467-477
Number of pages11
JournalAnnals of Applied Biology
Issue number3
Publication statusPublished - Nov 2011


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