Question

Mottle leaf of citrus is caused by the deficiency of

• A. Mo
• B. B
• C. Zn
• D. Cu

Hint:

Zinc deficiency in citrus causes characteristic mottle leaf symptoms.

Answer 1

The Correct Option is C

Zinc deficiency in citrus results in mottled leaves, small and narrow leaves, and rosette formation. It is commonly known as "mottle leaf" disease.

Answer 2

Comparing citrus micronutrient disorders: Molybdenum deficiency in citrus is rare and not linked to leaf mottling; boron deficiency causes gum pockets and corky, misshapen fruit rather than mottled leaves; copper deficiency causes dieback and gummosis of twigs.
Zinc deficiency, in contrast, is well documented in citrus as causing interveinal chlorosis that gives leaves a mottled, blotchy appearance, along with small, narrow leaves and rosetting, a symptom specifically called mottle leaf.
So the deficiency responsible is zinc.