Iron deficiency causes a uniform pale green chlorosis of the newest leaves; all other leaves remain dark green.  Initially, the veins remain green, which gives a net-like pattern.  If the deficiency is severe, the minor veins also fade, and the leaves may eventually burn, especially if exposed to strong sunlight. Good drainage and soil aeration favour iron availability.  Foliar sprays of iron sulphate (150 g/100 L) can be used to treat symptoms

Foliar spray of 0.5% FeSO4