Fanleaf

Question 1

Known as

Answer 1

Wingerdnetelblaar

Question 2

Where does it occur?

Answer 2

All viticultural regions

Question 3

Which cultivars are susceptible?

Answer 3

ALL

Question 4

Biological strains

Answer 4

Fanleaf,
yellow mosaic,
vein banding

Question 5

SHOOTS

Answer 5

short internodes

double nodes

abnormal branching

dwarfed shoot growth

zigzag growth pattern

Question 6

LEAVES

Answer 6

deformed & discolouration

asymmetrical leaf blades

main veins being drawn towards each other

petiole sinus is bigger and wider

chlorotic spots occur

Question 7

What happens after transfer to the plant material?

Answer 7

fanleaf associated particles move from cell to cell in all directions.
productivity and life expectancy influenced

Question 8

What causes the reduced productivity in fanleaf-infected grapevines?

Answer 8

severe millerandage

Question 9

Cause of millerandage

Answer 9

small/underdeveloped root system with a decrease in photosynthetic capacity caused by the leaf deformation/discolouration

Question 10

Less cytokinin production?

Answer 10

fewer root tips. this cause an imbalance amongst hormones