1 / 28

Why clean plants?

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

Download Presentation

Why clean plants?

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript


  1. Why clean plants?

  2. Leafroll virus effects • Delayed maturity • Lower sugar content • Increased acidity • Lower color • Decreased crop level Declining wine quality.

  3. Leafroll management costs 83 acre Cabernet vineyard

  4. Leafroll management costs • Costs associated with preventing spread • Insecticides • Crew movement • Extensive sanitation procedures • Loss of revenue potential

  5. 1994 planting – 11 years of revenue on a 30-40 year investment!!

  6. Leafroll management costs • Costs associated with preventing spread • Insecticides • Crew movement • Extensive sanitation procedures • Loss of revenue potential • Fallow period?

  7. Virus Spread

  8. Clean vines for new plantings • Certified material

  9. Clean vines for new plantings • Certified material • Next best thing…

  10. 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

  11. Sampling – case history • Chardonnay – “clean block” results • 20 positive results by ELISA • Not a viable block for propagation • Plan ‘B’

  12. 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.

  13. Sampling – case history • Chardonnay – plan ‘B’ results • False positive. • Bulk sampling showed no positive samples. • Use this block for propagation.

  14. 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$

More Related