In some trees, copper deficiency may cause blisters and deep slits in the bark from which exudes gum. This disease is known as

The Correct answer is EXANTHEMA. Exanthema disease is a deficiency symptom of copper in the plant, produced by SOIL factors and brought about by soil microorganisms, as they attack the ROOTS and produce harmful substances.It causes the yield of gums on the bark and affects the fruit-bearing capacity of the TREE. Dying of the leaves is a major characteristic symptom of exanthema. Hence, the correct answer is option 1. Dieback, common symptom or name of the disease, especially of woody plants, characterized by progressive death of twigs, branches, shoots, or roots, starting at the tips.Staghead is slow dieback of the upper branches of a tree; the dead, leafless limbs superficially resemble a stag's headDieback and staghead are caused by many fungi and a few BACTERIA that produce cankers, anthracnose, wilts, and stem or root rots.Nematodes, stem- or root-boring insects, mechanical damage, paving over roots, winter injury from cold or deicing salts, and a deficiency or excess of moisture or an essential element may cause dieback, directly or indirectly.