Manganese deficiency-Apples

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Nutrients

Apples - Chlorosis

Symptoms
Symptoms start at young, fully developed and medium leaves. They show yellow green or yellow interveinal chlorosis. Veins and streaks along the veins remain green. Sometimes leaves look like a mosaic, because also fine veins remain green. Later necrotic spots, sometimes white in colour, and necrotic blotches appear.

Reasons
Manganese deficiency

Apples - Chlorosis

Symptoms
Symptoms start at young, fully developed and medium leaves. They show yellow green or yellow interveinal chlorosis. Veins and adjacent tissue remain green. Sometimes leaves look like a mosaic, because also fine veins remain green. Later necrotic spots, sometimes white in colour, and necrotic blotches appear.

Reasons
Manganese deficiency

Manganese deficiency made worse by

Organic soils
Sandy soils
High pH
Cold wet periods
Fluffy soils

Manganese is important for

Vigorous shoot and leaf growth
Fruit quality and yield may be improved

Yara recommended fertilizers for Manganese

YaraVita® MANTRAC™

Apples: 1 l/ha prior to flowering in the case of severe deficiency. Otherwise commence at petal fall and repeat 10 to 14 days later. On russet sensitive varieties delay applications until 6 weeks after petal fall. Green background colour (Jonagold, Elstar, Cox, Golden Delicious, Granny Smith: 6 applications of 0.25 l/ha at 10 to 15 day intervals. Commence applications at June drop and end one month before harvest. Water rate: 300 to 1,000 l/ha. Pommiers: 1 l/ha avant floraison en cas de carence sévère. Autrement commencer après la chute des pétales et répéter à 10-14 jours d'intervalle. Sur les variétés sensibles au russetting retarder les applications jusquà 6 semaines après la chute des pétales. Coloration verte de fond (Jonagold, Elstar, Cox, Golden Delicious, Granny Smith): 6 applications de 0.25 l/ha tous les 10-14 jours. Commencer à la chute physiologique (basculement) et terminer 1 mois avant la cueillette. Volume d'eau: 300-1.000 l/ha.