PLANT MATERIAL & GRAFTING Flashcards
Give three reasons for planting grafted vines
- The desired variety has an unsuitable rootstock (or the other way around
- Create resistance to virus transmission
- Control vine size
What is a ‘scion’?
The variety that can be grafted on top of a rootstock
What is the average height and number of buds from a newly rooted cutting?
Height: 14mm
Buds: 1 or 2
Where will grafted vines be checked for? (5)
Good rooting system
Good grafting union
Enough buds on scion
Free from virus
Free from trunk diseases
Which two types of grafting do you have?
- Table grafting
- Vine grafting in existing vineyard
Describe the difference in planting season for ‘bare rooted’ and ‘potted’ plants from the nursery
Bare rooted: autumn or spring to avoid waterlogged soil and stressful conditions
Potted: summer or autumn, need to irrigate(!)
Name the the most important Asiatic vine rootstock and it’s features
Vitis Amurensis
Resistant to frost and downy mildew
Name the 3 most important American rootstocks
V. Riparia
V. Rupestris
V. Berlandieri
Name 7 criteria for choosing a rootstock
Tolerance phylloxera
Tolerance chlorosis
Vigor
Length vegetation cycle
Adaptation to dryness
Adaptation to humidity
Soil acidity
Which soils are particularly favourable for phylloxera?
Clay limestone
dry and superficial soils
What is chlorosis?
Iron deficiency due to high amounts of active limestone (powdered limestone) in the soil
What is CPI
Chlorosis Power Index
Which rootstock is best adapted to drought?
The American rootstock v. Rupestris
Name characteristics of v. Riparia (4)
Short cycle
Low vigour
Humidity tolerance
Chlorosis sensitivity
Name characteristics of v. Rupestris (4)
Long cycle
High vigor
Fertility and dryness tolerance
Little tolerance to chlorosis
