Pathogenicity of Botryosphaeria species isolated from declining grapevines in sub tropical regions of Eastern Australia

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Abstract

From 2002 to 2004, vines from 11 vineyards in the Hunter Valley region and from 4 vineyards in Mudgee (New South Wales, Australia) were inspected for foliar and wood symptoms of Eutypa dieback and Botryosphaeriacanker. Eutypa lata was not isolated, however species of Botryosphaeria were frequently isolated from dead and declining spurs, cordons and trunks.Two species conforming to the anamorphs of Diplodiaand Fusicoccum were isolated. Cultures on PDA producinga yellow pigment, and hyaline aseptate conidia(14-23.5 x 8-13 µm in size) were identified as B. lutea. Cultures with dark brown, 1-septate, ornamented conidia(15-25 x 8-14 µm in size) at maturity were identified as B. obtusa. Pathogenicity tests were conducted on detached green shoots, detached one-year-old canes and glasshouse-grown grapevines. In all situations, disease symptoms were reproduced and Koch's postulates were fulfilled. The results demonstrate the potential of B. obtusa and B. lutea as primary pathogens of Vitis vinifera.
Original languageEnglish
Pages (from-to)27-32
Number of pages6
JournalVitis - Journal of Grapevine Research
Volume46
Issue number1
Publication statusPublished - 2007

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