Survival and growth of Aspergillus carbonarius on wine grapes before harvest

Aspergillus carbonarius, the primary OTA-producing species in Australia, was inoculated onto the surface of Chardonnay and Shiraz bunches at pre-bunch closure, veraison and pre-harvest during the 2002–03 and 2003–04 seasons. Mean A. carbonarius counts decreased between pre-bunch closure and veraison...

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Bibliographic Details
Published in:International journal of food microbiology 2006-09, Vol.111, p.S83-S87
Main Authors: Leong, Su-lin L., Hocking, Ailsa D., Scott, Eileen S.
Format: Article
Language:English
Subjects:
Aspergillus - growth & development
Aspergillus - physiology
Aspergillus - radiation effects
Aspergillus carbonarius
Colony Count, Microbial
Consumer Product Safety
Food Contamination - analysis
Food Handling - methods
Food Microbiology
food pathogens
fruiting
fungal spores
growing season
Humans
microbial detection
Ochratoxin A
plant pathogenic fungi
plant rots
Risk Assessment
secondary metabolites
Spores, Fungal - growth & development
Spores, Fungal - radiation effects
Sunlight
toxigenic strains
Ultraviolet
ultraviolet radiation
Ultraviolet Rays
vines
Vineyards
viticulture
Vitis
Vitis - microbiology
wine cultivars
wine grapes
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Summary:Aspergillus carbonarius, the primary OTA-producing species in Australia, was inoculated onto the surface of Chardonnay and Shiraz bunches at pre-bunch closure, veraison and pre-harvest during the 2002–03 and 2003–04 seasons. Mean A. carbonarius counts decreased between pre-bunch closure and veraison, and increased between veraison and pre-harvest. Increases in A. carbonarius counts from veraison onwards were most marked in Chardonnay bunches during 2003–04; such bunches comprised more berries and were heavier than in 2002–03. Bunches with no berry damage yielded low A. carbonarius counts at pre-harvest and harvest. Exposure to direct sunlight over several days reduced viability of A. carbonarius spores supported on filter membranes by 10 5, despite the spores having thick, heavily melanised walls. The estimated cumulative UV exposure for that period was 10 mWh. Thus, UV radiation may be a contributory factor to the decline of A. carbonarius spores on berry surfaces, particularly in the early stages of berry development.
ISSN:0168-1605
1879-3460
DOI:10.1016/j.ijfoodmicro.2006.03.005