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Crop Thinning: Cost-Effective Methods to Improve Wine Quality

Learn about the benefits, costs, and outcomes of crop thinning in vineyards to enhance wine quality. Explore shoot thinning and mechanical thinning techniques, financial comparisons, risks, and considerations for implementation.

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Crop Thinning: Cost-Effective Methods to Improve Wine Quality

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  1. Crop ThinningCost Effective Methods to Improve Wine QualityJames FreckletonThe Yalumba Wine Company

  2. Background – Why thin? 2004 Vintage Heavy crops Quality problems – late ripening Resource issues-unable to secure labour Opportunity to trial new methods

  3. Financial Comparison

  4. Shoot Thinning

  5. Advantages Quality Canopy Balance Yield Reduction Cost Disadvantages Spur Position/ Damage Frost/ Poor Set Considerations End target Timing (early/ late) Weather Shoot thinning

  6. Thinning to early can lead to re-shooting

  7. Late

  8. Cost? Early thinning cost ($300 - $1,000 per ha) Late thinning cost ($1,000 - $1,300 per ha) Shoot thinning

  9. Actual cost of shoot thinning?

  10. Mechanical Thinning

  11. The Vineyard J Trial H A

  12. It would be nice if Ashley gave us a hand Can’t wait until the baby comes – no more of these bloody trials. Boy this is hard work!!

  13. Implementation – What Did We Do?Machine Set-Up 2 bow rods on either side Highest bow rod set approx 5 - 10cm below the cordon wire Remove buckets and fish plates Set a constant tractor speed of 2.1km/hr

  14. Results

  15. First Attempt!

  16. Control (not thinned) 26.9 T / Ha

  17. After The Harvester! Pea size berry

  18. Treatment - 440rpm (16ºC) 11t / ha Reduction 6.6% Shoot Damage

  19. Treatment - 480rpm (16ºC) 19.4t / Ha Reduction 9% Shoot Damage

  20. Treatment - 440rpm (25ºC) 11.5t/ Ha Reduction 3.7% Shoot Damage

  21. Treatment - 480rpm (25ºC) Change Slide 7.4 t / Ha Reduction 3.3% Shoot Damage 7.4 t / Ha Reduction 3.3% Shoot Damage

  22. Treatment - 520rpm (16ºC) 15.5 T / Ha Reduction 15% Shoot Damage

  23. Can You See A Difference? Control 440 rpm 520 rpm 480 rpm

  24. Shoot Damage

  25. Yield Loss Vs Time This graph indicates that actual % crop-loss at harvest is double that immediately following thinning. This is a result of desiccation of damaged bunches over time.

  26. Baume Vs Yield

  27. Maturity – Thinned Vs Un-thinned

  28. Current Practices Trial a row first Weather Conditions- warmer is better Timing-pea size Zone of fruit- target one area and hit hard Machine set-up Harvester Properties Beater speeds Beater location (mindful of Trellis system?) Machine speed Variety

  29. Machine Thinning Experiences with Other Varieties and Different Harvester Set-ups

  30. Sauvignon Blanc

  31. Shiraz

  32. Take Home Messages Final fruit destination Consider as cost effective options Timing of processes Weather Conditions

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