Pathogenicity of species implicated in Eutypa dieback disease of grapevines

Wayne Pitt, Florent P. Trouillas, Walter D. Gibler, Sandra Savocchia, Mark R. Sosnowski

Research output: Other contribution to conferencePosterpeer-review

Abstract

In addition to Eutypa lata, which causes Eutypa dieback, numerous other fungi in theDiatrypaceae family have been isolated from diseased grapevines (Vitis vinifera) and otherwoody hosts. Pathogenicity trials comprising 70 strains of diatrypaceous fungi representingnine species in six genera were conducted to determine whether these fungi, collected inAustralia, were pathogenic to grapevines. When inoculated into wounded trunks of ‘CabernetSauvignon’, eight species, including E. lata, E. leptoplaca, Cryptovalsa ampelina, C.rabenhorstii, Eutypella citricola, E. microtheca, Diatrypella vulgaris, and a Diatrype sp.produced necrotic lesions significantly longer than on controls. In addition, all nine species(including a Cryptosphaeria sp.) were reisolated from the margins of developing lesions andat varying distances above and below the point of inoculation. Diatrypaceous fungi werefrequently isolated from asymptomatic or otherwise healthy tissue several centimeters aheadof the disease margin. Methods to control diseases associated with diatrypaceous fungi musttake into account their propensity to colonize woody tissues ahead of, or in the absence ofvisible symptoms. Current recommendations for the management of Eutypa dieback usingremedial surgery and pruning wound protection appear sufficient for the control of the otherdiatrypaceous fungi included in this study.
Original languageEnglish
Publication statusPublished - 2013
EventAustralasian Plant Pathology (APPS) Conference - Auckland, New Zealand, New Zealand
Duration: 25 Nov 201328 Nov 2013

Conference

ConferenceAustralasian Plant Pathology (APPS) Conference
Country/TerritoryNew Zealand
Period25/11/1328/11/13

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