Effects of Uncinula necator on the yield and quality of grapes (Vitis vinifera) and wine

被引:105
|
作者
Calonnec, A
Cartolaro, P
Poupot, C
Dubourdieu, D
Darriet, P
机构
[1] UMR Sante Vegetale INRA ENITA, F-33883 Villenave Dornon, France
[2] Univ Bordeaux 2, Fac OEnol, F-33405 Talence, France
关键词
anthocyanins; crop damage; 3-mercaptohexanol; organoleptic test; wine;
D O I
10.1111/j.0032-0862.2004.01016.x
中图分类号
S3 [农学(农艺学)];
学科分类号
0901 ;
摘要
The effects of powdery mildew (Uncinula necator) on grape yield, juice and wine quality were quantified for cultivar Cabernet Sauvignon (CSa) in 1997 and 1999, and for Sauvignon blanc (Sa) in 1999. Analyses were carried out on batches of healthy berries to which known percentages (0-50%) of diseased berries were added, and on natural clusters that were classified into four visual classes from low (C-1) to high (C-4) disease severity. CSa diseased berries showed an average weight reduction of 12% (1997) and 20% (1999). The direct consequence of a higher percentage of smaller, diseased berries was a reduction in yield. The accompanying loss of weight in must from C-1 to C-4 clusters increased from 10 to 45%. Sugar content in diseased berries was not significantly different from disease-free berries in 1997, but was 20-21% (CSa) and 14% (Sa) higher in 1999. Severely infected batches also showed a higher total acidity than healthy ones. The total anthocyanin content of CSa was decreased by 0.91% (1997) and 0.66% (1999) per percentage mildewed berries added by weight. In Sa wines the concentration of 3-mercaptohexanol, a component of varietal aroma, was decreased by powdery mildew. Multidimensional analyses, based on all the variables studied, successfully grouped batches of CSa according to disease severity. Using directional triangular tests wine experts were able to recognize CSa wines produced from berries with approximate to25% of powdery mildew; the threshold for nonexperts was 50%. CSa wines obtained from samples with more than 30% of diseased berries by weight were significantly classified as the worst according to preference order criteria, but below this value the preference was not significant. Sa wines with <50% mildewed berries could not be differentiated significantly by organoleptic tests performed by nonprofessionals.
引用
收藏
页码:434 / 445
页数:12
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