Nutrients

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

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).

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).

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).

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).

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® BUD BUILDER™WP

YaraVita® BUD BUILDER™WP

Grapevines: Apply 1 to 3 applications of 5-10 lbs/acre applied bud break thru pre-bloom at a 10-14 day interval. Also, during post-bloom thru berry sizing 1-2 applications in 7-14 day intervals. Also apply post-harvest before leaf senescence. Water rate: minimum 25 gallons/acre. Foliar application of Bud Builder may leave a white residue-deposit on the leaf or crop when applied close to harvest.

Read more about YaraVita® BUD BUILDER™WP

YaraVita® POWERBOR™ Ca

YaraVita® POWERBOR™ Ca

Grapevines: 1 to 2 quarts/acre at flower truss visible, at flower buds separated and at fruit set. Also, 1 to 2 quarts/acre after harvest before leaf senescence. Water rate: 20 to 100 gallons per acre.

Read more about YaraVita® POWERBOR™ Ca