Question:
In guava red spots on the newly emerged leaves and dry and brittle leaves indicates the deficiency of
In guava red spots on the newly emerged leaves and dry and brittle leaves indicates the deficiency of
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Guava bronzing is most severe in waterlogged, highly alkaline, or heavily water-leached soils where zinc availability to the roots is limited.
Updated On: Jul 23, 2026
- Boron
- Zinc
- Phosphorus
- Potassium
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The Correct Option is B
Solution and Explanation
Step 1: Understanding the Concept:
Nutrient deficiencies in fruit crops produce distinct morphological symptoms.
Correctly diagnosing these symptoms is essential for implementing balanced nutritional management programs in orchards.
Step 2: Detailed Explanation:
In guava (*Psidium guajava*), the development of red or bronze spots on newly emerged leaves, along with dry, brittle leaves and reduced leaf size (little leaf), are classic symptoms of Zinc (Zn) deficiency.
This condition is commonly known as Guava Bronzing.
Zinc plays a critical role as an activator of various enzymes and is essential for the biosynthesis of auxin (indole-acetic acid), which drives cell division and elongation.
Under zinc-deficient conditions:
- Chlorophyll synthesis is disrupted, and anthocyanin pigments accumulate, producing red or purple spots on the leaves.
- Leaf growth is stunted, and tissues become brittle and dry, leading to twig dieback and reduced fruit size.
Applying zinc sulfate ($\text{ZnSO}_4$) as a foliar spray is the standard practice used to correct this deficiency in orchards.
Step 3: Final Answer:
The deficiency of Zinc causes red spots and brittle leaves in guava, corresponding to option (B).
Nutrient deficiencies in fruit crops produce distinct morphological symptoms.
Correctly diagnosing these symptoms is essential for implementing balanced nutritional management programs in orchards.
Step 2: Detailed Explanation:
In guava (*Psidium guajava*), the development of red or bronze spots on newly emerged leaves, along with dry, brittle leaves and reduced leaf size (little leaf), are classic symptoms of Zinc (Zn) deficiency.
This condition is commonly known as Guava Bronzing.
Zinc plays a critical role as an activator of various enzymes and is essential for the biosynthesis of auxin (indole-acetic acid), which drives cell division and elongation.
Under zinc-deficient conditions:
- Chlorophyll synthesis is disrupted, and anthocyanin pigments accumulate, producing red or purple spots on the leaves.
- Leaf growth is stunted, and tissues become brittle and dry, leading to twig dieback and reduced fruit size.
Applying zinc sulfate ($\text{ZnSO}_4$) as a foliar spray is the standard practice used to correct this deficiency in orchards.
Step 3: Final Answer:
The deficiency of Zinc causes red spots and brittle leaves in guava, corresponding to option (B).
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