Grapevines - Deformation
Symptoms
Only a few seeded berries set, most berries remain small and seedless. This is called millerandage, hen and chicken, or the pumpkin and pea symptom.
Causes
Boron deficiency
Boron deficiency is one of the most serious nonparasitic grapevine diseases. It is observed especially on strongly acid soils (pH 3.5 - 4.5).
Grapevines - Deformation
Symptoms
Only a few seeded berries set, most berries remain small and seedless. This is called millerandage, hen and chicken, or the pumpkin and pea symptom.
Causes
Boron deficiency
Boron deficiency is one of the most serious nonparasitic grapevine diseases. It is observed especially on strongly acid soils (pH 3.5 - 4.5).
Grapevines - Deformation
Symptoms
Only a few seeded berries set, most berries remain small and seedless. This is called millerandage, hen and chicken, or the pumpkin and pea symptom.
Causes
Boron deficiency
Boron deficiency is one of the most serious nonparasitic grapevine diseases. It is observed especially on strongly acid soils (pH 3.5 - 4.5).
Grapevines - Chlorosis
Symptoms
Boron deficiency symptoms on the leaves appear first as chlorosis on leaf margins. Chlorosis extends between the veins.
Later leaf margins show red brown colour and die off .
The main veins near them usually remain green.
Causes
Boron deficiency
Boron deficiency is one of the most serious nonparasitic grapevine diseases. It is observed especially on strongly acid soils (pH 3.5 - 4.5).
Grapevines - Discolouration
Symptoms
Fruit split and discoloration, caused by B deficiency.
Causes
Boron deficiency
Boron deficiency is one of the most serious nonparasitic grapevine diseases. It is observed especially on strongly acid soils (pH 3.5 - 4.5).
Calcium deficient plants are prone to fruit splitting as well.
Boron deficiency made worse by
- Sandy soils
- Alkaline soils
- Soils low in organic matter
- High levels of nitrogen
- High levels of calcium
- Cold wet weather
- Periods of drought
Boron is important for
- Improves flowering
- Improves fruit set
- Gives more even ripening
- Increases alcohol level in berries
- Increases sugar level in berries
Yara recommended fertilisers for Boron deficiency
YaraVita BORTRAC 150
Grapevines: 1 to 1.5 l/ha at flower truss visible, at flower buds separated and at fruit set. Also, 1 to 2 l/ha after harvest before leaf senescence. Water rate: 200 to 1000 l/ha.
Read more about YaraVita BORTRAC 150
