Nutrients

N Nitrogen
P Phosphorus
K Potassium
Mg Magnesium
Ca Calcium
B Boron
Fe Iron
Mn Manganese
Zn Zinc

Wine Grape - 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.

Reasons
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).

Wine Grape - 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.

Reasons
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).

Wine Grape - 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.

Reasons
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).

Wine Grape - 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.

Reasons
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).

Wine Grape - Discolouration

Symptoms
Fruit split and discoloration, caused by B deficiency.

Reasons
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 fertilizers for Boron

YaraVita BORTRAC 150

YaraVita BORTRAC 150

Grapevines: Soil application: 3 to 5 l/ha. Foliar application: 1.5 l/ha at flower truss visible and at flower buds separated, and again at fruit set. Water rate: 500-1000 l/ha.

Read more about YaraVita BORTRAC 150

Other recommended products

YaraVita MOLYBOR
Grapevines: 2 to 3 l/ha applied before flowering. Repeat at fruit set if necessary. Water rate: 200 l/ha.
YaraLiva NITRABOR
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YARA SOLUBLE BORON
Grapevines: 1-1.5 kg/ha at flower truss visible, at flower buds separated and at first fruit set. Also, 1-2 kg/ha after harvest before leaf senescence. Water rate: 200-1000 l/ha.