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

    127 Downloads (Pure)

    Abstract

    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
    https://awitc.com.au
    https://awitc.com.au/conference-program/ (Program)
    https://awitc.com.au/program/proceedings/seventeenth/ (Conference report)

    Conference

    Conference17th Australian Wine Industry Technical Conference (AWITC 2019)
    Country/TerritoryAustralia
    CityAdelaide
    Period21/07/1924/07/19
    OtherThe Australian Wine Industry Technical Conference is the premier technical event for the Australian wine industry. Held every three years since 1970, it combines an extensive program of plenary sessions, workshops, posters, student forum and social events with the industry’s most respected and extensive trade exhibition.

    The Australian Wine Industry Technical Conference Inc. has two members: The Australian Wine Research Institute and the Australian Society of Viticulture and Oenology.
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