Zinc is essential for growth as it plays a key role in many enzyme systems in plants. It controls the production of important growth regulators that influence new growth and development, thus one of the first indications of Zn deficiency is the presence of stunted plants. Zinc deficiency appears as a chlorosis in the interveinal areas of new leaves, producing a banding appearance. Leaf and plant growth become stunted and leaves eventually die and fall off the plant. At branch terminals of fruit and nut trees, rosetting occurs with considerable dieback of the branches.