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Use of nitrate non-utilizing (nit) mutants to determine phenological stages at which Botrytis cinerea infects wine grapes causing botrytis bunch rot

Citation

Hill, GN and Evans, KJ and Beresford, RM, Use of nitrate non-utilizing (nit) mutants to determine phenological stages at which Botrytis cinerea infects wine grapes causing botrytis bunch rot, Plant Pathology, 63, (6) pp. 1316-1325. ISSN 0032-0862 (2014) [Refereed Article]

Copyright Statement

Copyright 2014 British Society for Plant Pathology

DOI: doi:10.1111/ppa.12225

Abstract

Botrytis bunch rot (BBR), caused by Botrytis cinerea, degrades wine grapes during ripening, even though infection can occur as early as flowering. Effective BBR management requires knowledge of whether some stages of fruit development are more important than others in relation to infection and BBR severity at harvest. Bunches of Vitis vinifera ‘Sauvignon blanc’ and/or ‘Pinot noir’ were inoculated in two vineyard trials and one glasshouse trial with nitrate nonutilizing (nit) mutant strains at three phenological stages: early flowering, pre-bunch closure (PBC) and veraison. Isolates recovered from symptomless berries at veraison and from bunches with symptoms at harvest were screened to measure the incidence of the nit strains used in the inoculations. It was found that latent infections, which resulted in BBR at harvest, could become established at all three phenological stages and no single stage was associated with greater latent incidence or harvest severity than any other stage. It was concluded that a proportion of BBR at harvest resulted from the expression of latent infections that had accumulated throughout the season. However, the time between infection and BBR symptom expression in near-ripe grape berries was sufficiently short for polycyclic secondary infection to also contribute to epidemic development.

Item Details

Item Type:Refereed Article
Keywords:Botrytis cinerea, gray mold, grey mould, latent infection, nit mutants, Vitis vinifera
Research Division:Agricultural and Veterinary Sciences
Research Group:Horticultural Production
Research Field:Oenology and Viticulture
Objective Division:Plant Production and Plant Primary Products
Objective Group:Industrial Crops
Objective Field:Wine Grapes
Author:Hill, GN (Mr Gareth Hill)
Author:Evans, KJ (Dr Katherine Evans)
ID Code:91713
Year Published:2014
Web of Science® Times Cited:3
Deposited By:TIA - Research Institute
Deposited On:2014-05-27
Last Modified:2015-03-30
Downloads:0

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