Deficiency diseases

Deficiency diseases are generally referred to as chlorosis. The name means pallor or decolourisation. In almost all deficiency diseases, this is the main symptom, but there are also other symptoms and in some deficiency diseases, poor growth or deformation are in the foreground.
The cause of deficiency disease is, of course, poor nutrition.
Deficiency diseases are often divided into diseases due to a deficiency of a micro-element and diseases due to a deficiency of a macro-element. The microelements are: nitrogen, phosphorus, potassium, calcium, magnesium and sulphur; the macroelements are iron, boron, manganese, zinc, copper and molybdenum.

Above are some examples of leaves with deficiency disease, with a healthy grape leaf on the right for comparison.

Engelse naam	Franse naam	Symptomen	Status
Nitrogen deficiencyNitrogen deficiency	Carence en azote	Yellowing, starting in older leaves; poor growth	most common deficiency disease
Phosporus deficiencyPhosporus deficiency	Carence en phosphore	weak growth, curled leaves; yellowing leaves with red spots; (darker leaves later turning brown)	infrequent
Potassium deficiencyPotassium deficiency	Carence en potassium	yellow or red discolouration starting at edges of leaves; starts on older leaves; sometimes also necrotic dots; later also curling over
Calcium deficiency	Carence en calcium	Necrotic edge to leaf	Occurs infrequently in vineyards
Magnesium deficiencyMagnesium deficiency	Carence en magnesium	whitening, later red
Sulfur deficiency	Carence en soufre		rare
Iron deficiencyIron deficiency	Carence en fer; Chlorose ferrique	Yellowing with green veins; beginning in young leaves; later whitening
Boron deficiencyBoron deficiency	Carence en bore	Deformation of tendrils
Manganese deficiencyManganese deficiency	Carence en manganèse	yellowish discolouration between the veins
Zinc deficiencyZinc deficiency	Carence en zinc	irregular growth of young leaves; small leaves with sharp teeth; light green to yellow discolouration between veins
Copper deficiency	Carence en cuivre	Dark green and twisted leaves	rare in vineyards
Molybdenum deficiencyMolybdenum deficiency	Carence en molybdène	Begins with necrosis at the leaf margin	rare in vineyards
bunch stem necrosis; waterberry "bunch stem necrosis; waterberry "	dessechement de la rafle	Stems of berries dry up, grapes remain sour	often due to magnesium deficiency

Cognacton english

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