Leaf roll Flashcards
1
Q
how can it be eliminated
A
in vitro culture and heat therapy
2
Q
Symptoms depend on
A
- seasons
- environment
- cultivar
3
Q
When are symptoms visible?
A
November, yet regional and cultivar dependent
4
Q
Describe what happens with the leaves
A
The leaves become red at the basis and spread to the apical parts
5
Q
Associations of leaf roll
A
- smaller grapevines
- shorter shoots
- delayed budburst
- smaller leaves
- later leaf drop
- smaller root system
- leaf discolourations
- downward curling of leaf edges
6
Q
Red cultivars
A
intravenous redding + downward curling
7
Q
White cultivars
A
intravenous yellowing + downward curling
8
Q
Bunch appearances
A
smaller, fewer, looser bunches
suboptimal berry colouration, delayed ripening, lower sugar []
9
Q
Physiological reaction
A
Lower
sugar []
anthocyanin []
10
Q
Associated vectors
A
mealybug
