Leaf scorch of mango is caused by

The leaf scorch of mango is caused by K deficiency.
Scorching of leaf margins is the characteristic symptom of potassium deficiency.
Scorching starts from the tip downwards. Fruit quality is reduced. Trees with potassium deficiency are easily prone to pest and disease attacks.
Application of 1 kg muriate of potash or sulphate of potash along with 2 kg urea and 6 kg super phosphate during July - August in the basin could rectify potassium deficiency.