Die back disease in citrus is due to deficiency of
A
Mo
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B
B
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C
Cu
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D
Zn
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Solution
The correct option is A Cu Copper is required in all plant parts. Copper forms a component of enzymes, such as phenolases and tyrosinase.
Copper being a constituent of plastocyanin plays a role in photophosphorylation. Copper maintains the carbohydrate-nitrogen balance.
Deficiency symptoms of copper are- i. Causes die back of shoots especially in Citrus. ii. A disease called as exanthema, causes the yield of gums on the bark. iii. Reclamation disease is caused in plants growing on newly reclaimed soil, where seed formation is affected.