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Why clean plants?. Leafroll virus effects. Delayed maturity Lower sugar content Increased acidity Lower color Decreased crop level. Declining wine quality. Leafroll management costs 83 acre Cabernet vineyard. Leafroll management costs. Costs associated with preventing spread

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Leafroll virus effects
Leafroll virus effects

  • Delayed maturity

  • Lower sugar content

  • Increased acidity

  • Lower color

  • Decreased crop level

Declining wine quality.


Leafroll management costs 83 acre cabernet vineyard
Leafroll management costs 83 acre Cabernet vineyard


Leafroll management costs
Leafroll management costs

  • Costs associated with preventing spread

    • Insecticides

    • Crew movement

    • Extensive sanitation procedures

  • Loss of revenue potential


1994 planting –

11 years of revenue on a 30-40 year investment!!


Leafroll management costs1
Leafroll management costs

  • Costs associated with preventing spread

    • Insecticides

    • Crew movement

    • Extensive sanitation procedures

  • Loss of revenue potential

  • Fallow period?




Clean vines for new plantings1
Clean vines for new plantings

  • Certified material

  • Next best thing…


Sampling case history
Sampling – case history

  • Chardonnay – “clean block”

    • Field observations – not possible; dormant season

    • Bulk sampling – 4” cane samples from standardized location on each vine.

      • 164 random vines ~ 1%

    • Focus on most prevalent virus strains = 1,2,3


Sampling case history1
Sampling – case history

  • Chardonnay – “clean block” results

    • 20 positive results by ELISA

    • Not a viable block for propagation

  • Plan ‘B’


Sampling case history2
Sampling – case history

  • Chardonnay – plan ‘B’

  • ID a good block and reviewed results of previous testing.

  • During the growing season

    -visual symptoms surveyed in August.

  • 3 symptomatic vines found and tested for strains 1,2,3,5 & 7.

  • Bulk sample for GLRaV 3.


Sampling case history3
Sampling – case history

  • Chardonnay – plan ‘B’ results

    • False positive.

    • Bulk sampling showed no positive samples.

    • Use this block for propagation.


Deep thoughts virus management
Deep thoughts Virus management

  • Start with clean material!

  • Scout your vineyards

  • Keep good records

    • Scouting

    • Testing

    • Planting records

  • Make a plan

    • Infected vine removal (?)

    • Spread prevention measures

    • Replanting plan$


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