Why%20clean%20plants?

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Why clean plants?
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Leafroll virus effects

• Delayed maturity
• Lower sugar content
• Increased acidity
• Lower color
• Decreased crop level

Declining wine quality.
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Leafroll management costs 83 acre Cabernet
vineyard
Activity Who Cost
Scouting Hourly employees 1,057
Sampling Vit staff time ?
Analysis WSU 617
Vine Removal Hourly employees 588
Replanting Hourly employees 157
Watering Hourly employees 1,173

3,592
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Leafroll management costs

• Costs associated with preventing spread
• Insecticides
• Crew movement
• Extensive sanitation procedures
• Loss of revenue potential

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1994 planting 11 years of revenue on a 30-40
year investment!!
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Leafroll management costs

• Costs associated with preventing spread
• Insecticides
• Crew movement
• Extensive sanitation procedures
• Loss of revenue potential
• Fallow period?

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Virus Spread
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Clean vines for new plantings

• Certified material

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Clean vines for new plantings

• Certified material
• Next best thing

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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

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Sampling case history

• Chardonnay clean block results
• 20 positive results by ELISA
• Not a viable block for propagation
• Plan B

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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.

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Sampling case history

• Chardonnay plan B results
• False positive.
• Bulk sampling showed no positive samples.
• Use this block for propagation.

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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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