Apples - Chlorosis
Symptoms
Terminal buds die off. The youngest leaves first turn slightly chlorotic, then margins become scorched and roll inwards.
Causes
Boron deficiency
Apples - Deformation
Symptoms
Fruits show corking disorders and are often small and deformed.
Causes
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
Causes
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.
Causes
Boron deficiency
Symptoms can be confused with calcium deficiency. But boron deficiency causes symptoms in early state of fruit development, while calcium deficiency gives symptomes a few weeks before harvesting or in store.
Apples - Deformation
Symptoms
Surface of fruits shows corky areas and cracks. Fruits are often small and deformed.
Causes
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.
Causes
Boron deficiency
Apples - Cracking
Symptoms
Surface of fruits shows corky areas and cracks. Fruits are often small and deformed.
Causes
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 fertilisers for Boron deficiency
YaraVita BORTRAC 150
Apples: 1 to 2 l/ha at pink bud, start of flowering and again at petal fall. 2 l/ha after harvest but before leaf senescence. Water rate: 500-1,000 l/ha.
Read more about YaraVita BORTRAC 150
