Question

Black arm in Cotton is caused due to –

A Fungus Correct Answer Incorrect Answer
B Bacteria Correct Answer Incorrect Answer
C Deficiency of Iron Correct Answer Incorrect Answer
D Deficiency of Nitrogen Correct Answer Incorrect Answer
E Protozoan Correct Answer Incorrect Answer

Solution

Bacterial blight:  Xanthomonas campestris p.v malvacearum caused black lesions on stem and branches, premature drooping off of the leaves resulting in die back known as Black arm.

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