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Growing Season Climate

    Of the “serious” pome fruit producers, South Africa, together with Brazil, has the production areas closest to the equator. This means higher summer temperatures and generally, altogether more plant stress and more fruit downgraded for processing compared to our major competitors.

    The great inefficiency of caring for fruit that ultimately ends up in a juice bin significantly impacts the profitability of the South African industry, especially under the serious cost squeeze conditions that the industry is experiencing. It should not be surprising that research under this theme is predominantly aimed at decreasing sunburn and internal fruit quality defects brought about by climatic stress.

    Building on a project that modeled climate change into the future at a regional level, Prof Stephanie Midgley developed a climate change strategy for the deciduous fruit industry. The output of the aforementioned project is currently being incorporated into an App that will assist growers and technical advisors in long-term planning and site selection for new orchards. The implementation of the climate change strategy will be the responsibility of a sustainability manager who will join Hortgro in January 2024 to oversee the newly established sustainability and resource management programme.

    New projects were initiated to evaluate the effect of drape nets on the overall fruit quality of plums. It follows a similar project initiated in 2022 to evaluate drape nets on pears.

    EXPERTISE: GROWING SEASON CLIMATE WORKGROUP

    Research Team

    • Dr Elke Crouch
    • Dr Tara Southey
    • Prof Stephanie Midgley
    • Dr Esmé Louw
    • Dr Iwan Labuschagne
    • Ms C Smit
    • Mr Daniël Viljoen
    • Ms Heleen Tayler
    • Mr Handré Viljoen
    • Mr Tristan Dorfling
    • Mr Jason Ladegourdie
    • Ms Portia Solomon– MSc student
    • Ms Cara du Toit– MSc student
    • Ms Ineke de Jongh – MSc student

    Projects list

    • Evaluate the effect of drape nets on the overall plum fruit quality (H Viljoen)
    • Evaluation of the effect of drape nets on pear quality and productivity. (J Ladegourdie)
    • Quantification of the effect of near-harvest temperatures on pitburn and heat damage in cold stored plums and prediction method development (H Viljoen)
    • Climate profiling and change analysis of the Elgin-Grabouw-Vyeboom-Villiersdorp (EGVV), Koue Bokkeveld (KBV) and Langkloof (LK) production areas specific to Pome fruit (T Southey) - see Dormancy
    • Confronting climate change (C Smit)
    • Historic and future modelling and mapping of early season temperature patterns and extremes, and impacts for pome and stone fruit production in South Africa (S Midgley)
    • Internal browning of ‘Cripps Pink’ apples – effect of growing region temperature on radial browning and effect of canopy position on long-term storage quality (E Crouch, H Tayler and I de Jong)
    • Adaptability indexing of new pome (apple and pear) and stone fruit (plum and cherry) cultivars in diverse South African growing areas (I Labuschagne, E Louw, P Solomon, C du Toit and T Dorfling) - see Dormancy
    • Climate Change Response Strategy for the Deciduous Fruit Industry of South Africa. (S Midgley)
    • Enabling the calculation of carbon sequestration in the Confronting Climate Change Initiative’s online carbon calculator (C Smit)
    • Effect of nets on growth, yield and fruit quality as well economic feasibility in plums. (K Theron and N van Rensburg [Abstract]
    • Heat damage in plums. (W Steyn, M Jooste and B Makeredza) [Abstract]
    • Quantifying the role of vapour pressure deficit in the development of lenticel breakdown in Braeburn apples (D Viljoen and E Lötze) [Abstract]
    • Langkloof Seminar – 24 November 2021
    • Hortgro Technical Symposium Day 1 – 6 June 2022
    • Hortgro Technical Symposium Day 2 – 7 June 2022
    • Hortgro Technical Symposium Field Day – 10 June 2022
    • Hortgro Pome Fruit Research Showcase – 6 June 2023
    • Hortgro Stone Fruit Research Showcase – 7 June 2023
      
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