Assessment of sunburn damage in Chardonnay grapes in relation to leaf removal timing

Joanna Gambetta, Valentina Romat, Bruno Holzapfel, Leigh Schmidtke

Research output: Other contribution to conferencePosterpeer-review

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Sunburn damage commonly appears as browning of the berry surface when these are directly exposed to sunlight in combination with high temperatures and ultraviolet radiation. Factors such as variety, berry developmental stage, ambient temperature, water availability and viticultural practices (i.e. defoliation) modulate the intensity of symptoms. Leaf removal is a common practice in cool viticultural areas to reduce disease pressure. However, overexposure of bunches can lead to a higher degree of sunburn. Previous research indicates that if performed before véraison, defoliation leads to an early accumulation of photoprotective compounds such as the flavonoids and the carotenoids which would protect the berry from UV damage and reduce the intensity of sunburn but evidence is lacking. The aim of this study was to evaluate the effect of leaf removal timing on the incidence of sunburn as well as on the concentration of photoprotective compounds.
Original languageEnglish
Publication statusPublished - Jul 2019
Event17th Australian Wine Industry Technical Conference (AWITC 2019) - Adelaide Convention Centre, Adelaide, Australia
Duration: 21 Jul 201924 Jul 2019


Conference17th Australian Wine Industry Technical Conference (AWITC 2019)
Internet address


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