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Cultural practices for disease control
 

Cultural practices for disease control

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    Cultural practices for disease control Cultural practices for disease control Presentation Transcript

    • Cultural Practices For Disease Control in Vineyards
      Caine Thompson, Viticulturist,
      Mission Estate Winery
    • It Starts With Pruning
      Purpose - to set vines up for growing season
      - remove innoculum sources
      - prune with balance in mind –avoid conjecstion
      Cane pruning - number, selection, size, bud spacing, wrap
      Spur pruning - number, buds, height?
    • Shoot Thinning For Space
      Purpose – to remove surplus shoots and to moderate crop yield
      Advantages – open canopy, aeration, spray penetration, light
      How – cane prune – doubles, unders, heads
      How – spur prune – shoots per spur?
      Severity depends on site and also end use of fruit
    • Leaf Plucking
      Purpose – to open up bunch zone
      Advantages – spray penetration, aeration, promotion of ripening, disease control –powdery, botrytis
      Exposure – check with winery
      Options – machine, hand, sheep
    • Leaf Plucking
    • Canopy Management
      Tucking – keep shoots upright and within wires – care required
      Shoot positioning – ultimate for disease control. Implemented at shoot thinning can be taken to actual shoot tying
    • Canopy management
    • Bunch Thinning
      Purpose to moderate crop load/remove disease/reduce crowding
      Timing – berries peas size
      Supervision required
      If pruned well, shoot thinned, positioned, then bunch thinning may not be required
      Required when bunches touching/growing together and/or when crop load limits ripening potential
    • Bunch Trash Removal
      Seen to be perhaps the key for botrytis control in white varieties in particular
      Collard leaf plucker – proven to clear trash from bunches and to significantly improve botrytis control at harvest
      Chris Henry Canopy Blower – trials being conducted this year
    • Flowers for insect control
      Purpose to encourage bio control – parasitic wasp predation of LBAM
      Sow every 10th row (30m)
      Phacelia (3kg/ha) Buckwheat (25kg/ha)
      Direct drill to reduce costs
      Costs $26/ha
      Prodigy costs $36/ha
      Benefits soil structure
    • Flowers for insect control
    • Endopathegentic Control of Mealybug
      Endopathegentic fungi being trialled in Virus Elimination Project
      Natural product fungus – Biogro certified
      Been used extensively in Greenhouses in NZ with good results
      Being trialled in a 2ha trial comparing conventional vs fungi
    • Endopathegentic Control of Mealybug
    • Summary
      Cultural management is the key for managing disease in an organic system
      An open canopy is essential
      Prune for shoot position
      Shoothin for vine balance
      Leaf pluck to open bunch zone
      Balance is the key