in Plant Nutrition (Mineral Nutrition in Plants) by

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Exanthema disease is a deficiency symptom of Copper in 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 fruit bearing capacity of the tree. Dying of the leaves is a major characteristic symptom of exanthema.

As it is attributed to soil conditions, the suffered trees can be cured by application of copper salts to the soil.
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