The Correct answer is Exanthema. Important Notes: • 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. Explanation & Key Takeaways: • 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 head • Dieback 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.