NDLI: The role of Diaporthe perjuncta in delayed budburst and death of grapevine buds

Content Provider	Springer Nature Link
Author	Rawnsley, B. Wicks, T. J. Stummer, B. E. Scott, E. S.
Copyright Year	2006
Abstract	Diaporthe perjuncta has been associated with Phomopsis cane and leaf spot disease of grapevine in Australia. Both D. perjuncta and Phomopsis viticola cause bleaching of cane and, for this reason, diagnosis of the two fungi is often confused in the vineyard. P. viticola causes leaf spots and shoot lesions in the growing season, whereas more recent studies have indicated that D. perjuncta might not be a pathogen. Field studies were conducted to assess the role of D. perjuncta in delayed budburst and death of grapevine buds. Over three seasons (1999–2001), vines were assessed at four vineyards in South Australia for percentage of budburst and incidence of D. perjuncta. A D. perjuncta-specific probe, pT1P180, was used to detect D. perjuncta in unburst buds, cane and shoots on spurs having buds that failed to burst. D. perjuncta was detected in both bleached and non-bleached cane. Although there was a significant association between the incidence of D. perjuncta and buds that failed to burst in 1999 only, overall bud burst was normal in all vineyards and bud loss was not a concern. Bunch number and shoot growth was not affected. Mites were considered as a possible factor in damage to unburst buds, but it was more likely that failure of buds to burst was related to physiological or environmental effects. D. perjuncta did not adversely affect grapevine productivity and cannot be regarded as a pathogen of grapevine.
Starting Page	265
Ending Page	273
Page Count	9
File Format	PDF
ISSN	01560972
Journal	Australasian Plant Pathology
Volume Number	35
Issue Number	2
e-ISSN	14486032
Language	English
Publisher	Springer Netherlands
Publisher Date	2006-01-01
Publisher Institution	Australasian Plant Pathology Society
Publisher Place	Dordrecht
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Plant Pathology Plant Sciences Agriculture Entomology Ecology
Content Type	Text
Resource Type	Article
Subject	Plant Science

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