Question:
Stem rot disease of rice occurs at a stage from
Stem rot disease of rice occurs at a stage from
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Stem rot (Sclerotium oryzae) is associated with plant lodging and the presence of small, black sclerotia inside the rotted stem cavity during the panicle initiation to booting/maturity stages.
Updated On: Aug 7, 2026
- Panicle initiation to booting
- Pre tillering to mid tillering
- Pre flowering-Post flowering
- Nursery to Tillering
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The Correct Option is A
Solution and Explanation
Step 1: Understanding the Concept:
Stem rot is an important fungal disease of rice caused by Sclerotium oryzae.
The pathogen survives as sclerotia in the soil and crop residues, which float on irrigation water to infect the leaf sheaths at the water level.
Step 2: Detailed Explanation:
Symptoms of stem rot typically become visible during the later stages of crop development.
Initial infection may begin around late tillering, but the disease becomes active and destructive between the panicle initiation and booting stages.
During this reproductive phase, physiological changes in the plant increase its susceptibility.
The fungus forms small, dark, irregular lesions on the outer leaf sheath near the water level.
The lesions expand inward, eventually penetrating the stem.
This causes the culm to rot, leading to lodging, unfilled grains, and reduced yields.
Infected plants often contain numerous tiny, black, spherical sclerotia inside the hollow, rotted stems.
Step 3: Final Answer:
Stem rot disease of rice primarily occurs and causes damage from the panicle initiation to booting stage, which corresponds to Option (A).
Stem rot is an important fungal disease of rice caused by Sclerotium oryzae.
The pathogen survives as sclerotia in the soil and crop residues, which float on irrigation water to infect the leaf sheaths at the water level.
Step 2: Detailed Explanation:
Symptoms of stem rot typically become visible during the later stages of crop development.
Initial infection may begin around late tillering, but the disease becomes active and destructive between the panicle initiation and booting stages.
During this reproductive phase, physiological changes in the plant increase its susceptibility.
The fungus forms small, dark, irregular lesions on the outer leaf sheath near the water level.
The lesions expand inward, eventually penetrating the stem.
This causes the culm to rot, leading to lodging, unfilled grains, and reduced yields.
Infected plants often contain numerous tiny, black, spherical sclerotia inside the hollow, rotted stems.
Step 3: Final Answer:
Stem rot disease of rice primarily occurs and causes damage from the panicle initiation to booting stage, which corresponds to Option (A).
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