Why clean plants
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Why clean plants? PowerPoint PPT Presentation


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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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Why clean plants?

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Why clean plants

Why clean plants?


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


Why clean plants

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?


Virus spread

Virus Spread


Clean vines for new plantings

Clean vines for new plantings

  • Certified material


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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