Boron deficiency-Apples

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Nutrients

Apples - Chlorosis

Symptoms
Terminal buds die off. The youngest leaves first turn slightly chlorotic, then margins become scorched and roll inwards.

Reasons
Boron deficiency

Apples - Deformation

Symptoms
Fruits show corking disorders and are often small and deformed.

Reasons
Boron deficiency Symptoms can be confused with calcium deficiency. But boron deficiency causes symptoms in early state of fruit development, while calcium deficiency gives symptoms a few weeks before harvesting or in store.

Apples - Deformation

Symptoms
Fruits are small and deformed and necrotic with sunken areas which give a dimpled appearance

Reasons
Severe boron deficiency Symptoms can be confused with apple scab (caused by Venturia inaequalis)

Apples - Deformation

Symptoms
Fruits with boron deficiency (left hand side) compared with healthy fruits. Fruits show corking disorders and some are small and deformed.

Apples - Deformation

Symptoms
Surface of fruits shows corky areas and cracks. Fruits are often small and deformed.

Reasons
Severe boron deficiency Symptoms can be confused with apple scrap (caused by Venturia inaequalis)

Apples - Corky areas

Symptoms
Corky spots appear on the bark of lateral shoots.

Reasons
Boron deficiency

Apples - Cracking

Symptoms
Surface of fruits shows corky areas and cracks. Fruits are often small and deformed.

Reasons
Severe boron deficiency Symptoms can be confused with apple scrap (caused by Venturia inaequalis)

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 bud development
Improves flowering
Improves fruit set
Gives better skin finish
Reduces storage disorders

Yara recommended fertilizers for Boron

YaraLiva NITRABOR

Apple: For best results, For tree age 8-15 years, First application at bud burst - pink bud stage : 500 g/plant. Second Application at post-harvest stage : 500 g/plant. First application from Bud burst - Pink bud stage : 750 g/plant. Second Application at post-harvest stage : 500 g/plant.