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Ven 101B Midterm
Terms in this set (20)
Explain Guyot pruning
1. Based off previous 2 bud spur
2. Keep bottom position
3. Top one: cane and fruit (clean pure)
4. Works nice in low vigor areas
5. Spur= bottom position (2 bud)
6. Upper= fruiting cane
How does cane pruning benefit Cluster Development:
1. Reduces vine development
2. Removes wood; reduces vine vigor/increases cluster development
3. Happens during season
4.Less vigor in season, better berry set & light exposure
How does cane pruning benefit Flowering:
1. Moving up bud break will affect flowering
2. Removes stores: encourages plant to be activated sooner
3. Happens during dormancy
Describe bull cane's morphological characteristics:
1. Shield-like buds
2. Dome shaped/flattened buds
3. Longer internodes
Why don't we leave bull canes as canes or cordons?
1. Try to fruit bad
2. Use as cordons; no push
3. Trying to spread and go in new area (lay down to ground)
What are your objectives for a 3-year old head trained cane pruned vine on a moderate vigor site?
1. Arms good amount below fruiting wire (~1 ft)
2. Head already established; establish arm position
3. Push arms outwards: Guyot positions-cropping not viable
4. Drop crop
Describe two serious mistakes made when pruning/training these 3 year old vines:
1. Overcropping: having to drop crop or root system will be negatively affected
2. Not establishing vine shape
3. Think about renewal positions; not where to lay cane spot first
List 2 advantages and disadvantages to pruning early:
1. Labor-> expensive later
2. Less Eutypa: heavy rain in area
1. Frost: double pruning
2. Barne's affect: cutting off major nutrients (Potassium/Boron)
List 2 advantages and disadvantages to pruning late:
1. Less Eutypa/Fungal Diseases
2.Cuts heal better in warm
1. Delay Bud Break
2. Labor: very pricey
Explain how minimally pruned vines adapt and produce quality fruit:
1. Self Regulation
2. Grapes preset growth for future vines
3. Fruit on outside of vines
4. More light penetration
5. Greater ripening
6. Fruit location
Describe 3 metrics to judge vine balance:
1. 3-4 inch intervals (node)
2. Pruning index: 4-10/5-8; pruning weight: pounds per vine
3. 2 ounces: 1 cane
Which Trellis/spacing/pruning style would you choose and why?
Yield is king so 4A especially in San Joaquin Valley because I won't get as much money.
10 ft of row: can mechanically harvest
Winemaker tells visitors that the yield is 3 T/A. How do you reconcile with what was expected?
Too much fruiting & clusters were growing too close to each other. Caused quality of grapes to decrease so had to cut crop.
Given that the vines are 3.3 ft apart, how high should cordons be?
0.5 to 1.5 ft
What will they have to do to maintain vine canopy and achieve cropping/quality goals?
1. Have good pruning team
2. Not get overly vigorous/vegetative growth
3. Not too many clusters in one area so won't have to cut crop.
4. Good positions so don't have too many/few vines.
How can you distinguish a cane from a lateral or dormant bud?
1. Looking at the wood: shredded or smooth
2. Lateral buds are missing whorl of buds at base
3. Dormant buds are more straight
Objectives of CTSP quad trellis in Year 1-4 (High capacity site, long warm growing season)
-Establish rods and begin trunk on vigorous site
-Make sure trunk established
-Start establishing cordon
-Make sure cordon is established
-Make sure arm positioning is correct
-Pruning becomes routine as vine matures
Objectives of CTSP quad trellis in Year 1-4 (Low capacity site, short & cool growing season)
-Cut to 2 bud spur
-Train 2 shoots to remove next year
-Establish arm position
-pruning becomes routine as vine matures
-First cropping year
Advantage & Disadvantage to the 2 ways to attach cane to cordon wire so it becomes a cordon:
1. Wrap around cordon wire (Dont have to tie to wire but will also grow into wire)
2. Tie cane to wire (Ties break/must be replaced & wont grow into/become part of wire so could retrain)
How to prune/redevelop poorly trained high vigor cordon with rolled arm position:
1. Prune spurs in way to give more upright than outward growth.
2. Cut back arm completely/try to retrain.
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