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Considerations for Picking and
Lab Analysis During Harvest
Anna Welch Prost & Olivier Prost
• STYLE – INTENTION – CHALLENGES
• DATA COLLECTION
• A COMMON LANGUAGE
MEASURE WHAT MATTERS
HarvestBloom
+85-90 days
Bloom
+95-100 days
Bloom
Picking
decision!
GDD
Air Quality
GDD
Air Quality
Brix
pH
TA
GDD
Air Quality
A. Brix
pH
TA
B. Juice Panel
C. Phenolics
Baseline Sampling Maturity Check
• Brix
• pH
• TA
• Malic
• Tartaric
• Ammonia
• Primary Amino Nitrogen
• YAN
• Glucose/Fructose
• Potassium
GROWING SEASON
• Pick dates across
the regions
• Fruit Condition
• Blend projections
• X-factors
PICKING
2018 2017 2016
• Uniformity of the Process
• Equipment
• Juice Panels
MATURITY SAMPLES
CLUSTERS
CRUSHER
JUICE
Brix pH TA Malic Tartaric Ammonia
Primary Amino
Nitrogen
YAN
Glucose/
Fructose
Potassium
Standard
Chemistries Ratio of Acids
Predictions for a
Healthy Ferment
Estimate
Potential Alcohol
pH Buffering &
Cold Stability
JUICE PANELS
A TO Z WINEWORKS WHITE AND ROSÉ WINES
• Majority of fruit is machine harvested
• Stainless steel fermentations
• No malolactic fermentation
• Finished under screwcap
INTENTION
A280 A420
A520
(pH 1)
L* a* b* C* h°
Visible Color &
Hue CIELAB
Anthocyanin
(amount of red)
Harshness &
Browning
WHITE & ROSÉ WINE PHENOLICS & COLOR
GRAPE PHENOLIC MATURITY:
WHAT DOES IT LOOK LIKE?
CONDUCTING BERRY SENSORY ASSESSMENT
IN-HOUSE:
Glories Method:
Anthocyanins concentration
Extractable anthocyanins
Seed contribution
Total phenolics
THIRD PARTY LAB:
Anthocyanins
Tannins
Catechin
GRAPE PHENOLIC MATURITY:
HOW TO MEASURE IT?
REGIONAL DIFFERENCES
COLUMBIA RIVER GORGE
harvest 2019 data
UMPQUA VALLEY
REGIONAL DIFFERENCES
COLUMBIA RIVER GORGE
harvest 2019 data
UMPQUA VALLEY
More time677
201
39
1352
386
217
123 DAYS UNTIL BLOOM…MAYBE?
Who is ready?
HARVEST 2020

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2020 Oregon Wine Symposium | Considerations for Picking and Lab Analysis During Harvest - Anna and Olivier Prost

  • 1. Considerations for Picking and Lab Analysis During Harvest Anna Welch Prost & Olivier Prost
  • 2. • STYLE – INTENTION – CHALLENGES • DATA COLLECTION • A COMMON LANGUAGE MEASURE WHAT MATTERS
  • 3. HarvestBloom +85-90 days Bloom +95-100 days Bloom Picking decision! GDD Air Quality GDD Air Quality Brix pH TA GDD Air Quality A. Brix pH TA B. Juice Panel C. Phenolics Baseline Sampling Maturity Check • Brix • pH • TA • Malic • Tartaric • Ammonia • Primary Amino Nitrogen • YAN • Glucose/Fructose • Potassium GROWING SEASON
  • 4. • Pick dates across the regions • Fruit Condition • Blend projections • X-factors PICKING 2018 2017 2016
  • 5. • Uniformity of the Process • Equipment • Juice Panels MATURITY SAMPLES CLUSTERS CRUSHER JUICE
  • 6. Brix pH TA Malic Tartaric Ammonia Primary Amino Nitrogen YAN Glucose/ Fructose Potassium Standard Chemistries Ratio of Acids Predictions for a Healthy Ferment Estimate Potential Alcohol pH Buffering & Cold Stability JUICE PANELS
  • 7. A TO Z WINEWORKS WHITE AND ROSÉ WINES • Majority of fruit is machine harvested • Stainless steel fermentations • No malolactic fermentation • Finished under screwcap INTENTION
  • 8. A280 A420 A520 (pH 1) L* a* b* C* h° Visible Color & Hue CIELAB Anthocyanin (amount of red) Harshness & Browning WHITE & ROSÉ WINE PHENOLICS & COLOR
  • 9. GRAPE PHENOLIC MATURITY: WHAT DOES IT LOOK LIKE?
  • 10. CONDUCTING BERRY SENSORY ASSESSMENT IN-HOUSE: Glories Method: Anthocyanins concentration Extractable anthocyanins Seed contribution Total phenolics THIRD PARTY LAB: Anthocyanins Tannins Catechin GRAPE PHENOLIC MATURITY: HOW TO MEASURE IT?
  • 11. REGIONAL DIFFERENCES COLUMBIA RIVER GORGE harvest 2019 data UMPQUA VALLEY
  • 12. REGIONAL DIFFERENCES COLUMBIA RIVER GORGE harvest 2019 data UMPQUA VALLEY More time677 201 39 1352 386 217
  • 13. 123 DAYS UNTIL BLOOM…MAYBE? Who is ready? HARVEST 2020