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New Zealand Plant Protection 65 (2012): 262-266

Pathogenicity of a New Zealand grapevine isolate of Neofusicoccum macroclavatum on Eucalyptus globulus

R. Billones-Baaijens, E.E. Jones, H.J. Ridgway and M.V. Jaspers

ABSTRACT

Neofusicoccum macroclavatum, a recognised pathogen of Eucalyptus globulus in Western Australia, was recently isolated for the first time from grapevines in New Zealand. Its identity was confirmed by analysis of ribosomal DNA (rDNA), β-tubulin gene and elongation factor α1 sequence analyses. Previous pathogenicity studies of nursery isolates showed that this isolate (M353) was pathogenic to Sauvignon blanc 1-year-old rooted canes and green shoots similar to other Botryosphaeriaceae pathogens of grapevines. To further investigate its pathogenicity on eucalypts, M353 was inoculated onto 1-year-old seedlings of E. globulus and shown to produce external stem lesions with a mean length of 29 mm that was significantly longer (P<0.001) than those caused by N. australe (17 mm), another common Botryosphaeriaceae pathogen of Eucalyptus in Australia. This research demonstrates that the N. macroclavatum isolated from grapevine is pathogenic to eucalypts.

Keywords: Neofusicoccum macroclavatum, Botryosphaeriaceae, grapevines, Eucalyptus globulus.

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