Which pathogen causes Aggregate Sheath Spot of rice?

Which pathogen causes Aggregate Sheath Spot of rice?

• A. Rhizoctonia oryzae-sativae
• B. Pyricularia grisea
• C. Fusarium oxysporum
• D. Nezara viridula

Answer: (A)

The pathogen that causes Aggregate Sheath Spot of rice is Rhizoctonia oryzae-sativae. This fungal organism is known for its specific association with the disease, leading to symptoms such as dark, water-soaked spots on leaf sheaths and reduced plant vigor. Understanding the biological characteristics of Rhizoctonia oryzae-sativae helps in recognizing the signs of the disease and implementing effective management strategies. The other pathogens listed, such as Pyricularia grisea, are associated with different rice diseases, like blast disease, and do not cause Aggregate Sheath Spot. Fusarium oxysporum is known for causing wilts in various plants but not specifically in rice related to this disease. Nezara viridula is a species of stink bug that can be harmful by feeding on rice but is not a fungal pathogen and does not cause Aggregate Sheath Spot. Recognizing the role of the correct pathogen is essential for targeted treatment and prevention efforts in rice cultivation.

The pathogen that causes Aggregate Sheath Spot of rice is Rhizoctonia oryzae-sativae. This fungal organism is known for its specific association with the disease, leading to symptoms such as dark, water-soaked spots on leaf sheaths and reduced plant vigor. Understanding the biological characteristics of Rhizoctonia oryzae-sativae helps in recognizing the signs of the disease and implementing effective management strategies.

The other pathogens listed, such as Pyricularia grisea, are associated with different rice diseases, like blast disease, and do not cause Aggregate Sheath Spot. Fusarium oxysporum is known for causing wilts in various plants but not specifically in rice related to this disease. Nezara viridula is a species of stink bug that can be harmful by feeding on rice but is not a fungal pathogen and does not cause Aggregate Sheath Spot. Recognizing the role of the correct pathogen is essential for targeted treatment and prevention efforts in rice cultivation.