02865naa a2200289 a 450000100080000000500110000800800410001902200140006002400390007410000160011324502250012926000090035450001370036352018560050065000150235665000080237165000160237965300130239565300150240865300110242365300170243465300200245170000160247170000190248770000180250677300510252410573012017-06-26       2017    bl uuuu     u00u1 u    #d  a0304-42387 a10.1016/j.scienta.2017.05.0342DOI1 aFERRARI, V.  aInfluence of timing and intensity of fruit zone leaf removal and kaolin applications on bunch rot control and quality improvement of Sauvignon blanc grapes, and wines, in a temperate humid climate.h[electronic resource]  c2017  aArticle history: Received 6 November 2016; Received in revised form 22 May 2017; Accepted 24 May 2017. Available online 27 May 2017.  aABSTRACT.  Leaf removal is beginning to receive consideration for many growers as an important cultural practice for bunch rots control. It is normally applied after veraison and almost only on red varieties because of the high sunburn susceptibility of white grapes varieties under Uruguayan climatic conditions. The aim of this study was to determine the time and intensity of leaves removal impact on bunch rots and grapes quality on Sauvignon blanc. In parallel, the effects of kaolin (Surround® WP) applications in reducing the negative  impact of excessive exposure to high temperatures were evaluated. Different intensities and times of defoliation, in combination with kaolin applications, were evaluated over 2006/07, 2007/08 and 2008/09 seasons. All defoliation treatments and mainly those made after fruit set, significantly reduced the occurrence of bunch rots, having a critical impact on those metabolites responsible for the final taste of wines. Early defoliation was significantly more effective controlling Botrytis incidence and improving berry quality than later in the season. Leaf removal had a determining impact over fruit quality and primary and secondary metabolites contents. An increase in soluble solids and glycosides concentrations was observed, while IBMP grape content was reduced, thus affecting the flavor of Sauvignon blanc wines. Kaolin applications significantly reduced berries temperature, sunburn and other berry damages associated with clusters solar exposure. In sum, leaves removal and exogenous kaolin application in Sauvignon blanc showed great potential as Botrytis mitigation strategy because it positively impacts berry quality as a result of many molecular and biochemical changes in key secondary metabolic pathways. Simultaneously reducing berry sunburn.  © 2017 Elsevier B.V. All rights reserved.  aVARIEDADES  aVID  aVITICULTURA  aBROWNING  aBUNCH ROTS  aKAOLIN  aLEAF REMOVAL  aSAUVIGNON BLANC1 aDISEGNA, E.1 aDELLACASSA, E.1 aCONIBERTI, A.  tScientia Horticulturae, 2017gv.223, p. 62-71.