Grapevines - Discolouration
Symptoms
Starting on the tips grapes turn brown and dry out.
Causes
Calcium deficiency
Grapevines - Discolouration
Symptoms
Low calcium concentrations produce brown discoloration and rotting starting on the tips of grapes. Subsequently grapes dry out.
Causes
Calcium deficiency (upper row)
Calcium deficiency made worse by
- Acidic soils
- Sandy or light soils (leaching)
- Acid peat soils
- Soils rich in sodium
- Soils rich in aluminium
- Drought conditions
- Fruit high in nitrogen or potassium
- Large fruit
Calcium is important for
- Improved berry quality
- Reduction of grape stalk necrosis
- Improved berry firmness and storage potential
Yara recommended fertilisers for Calcium deficiency
YaraVita STOPIT
Grapevines: 7 to 10 l/ha. Repeated applications at 7 to 14 day intervals from fruit set. Water rate: 500 to 1000 l/ha.
Read more about YaraVita STOPIT
