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Questions and Answers
What is the causal organism of the blast of rice disease?
What is the causal organism of the blast of rice disease?
- Rhizoctonia solani
- Pyricularia grisea (correct)
- Fusarium oxysporum
- Magnaporthe oryzae
What percentage of economic loss can result from rice blast?
What percentage of economic loss can result from rice blast?
- 10 to 30%
- 61 to 90%
- 0 to 10%
- 30 to 61% (correct)
Which symptom is specifically associated with neck blast in rice?
Which symptom is specifically associated with neck blast in rice?
- Yellowing of lower leaves
- Spindle-shaped spots on leaves
- Large brown spots on the sheath
- Black lesions on the peduncle (correct)
What happens to the plant parts above infected nodes during nodal blast?
What happens to the plant parts above infected nodes during nodal blast?
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How do symptoms of leaf blast appear initially on the leaves?
How do symptoms of leaf blast appear initially on the leaves?
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Study Notes
Blast of Rice
- Caused by the fungus Pyricularia grisea (Cooke) Sacc (= P.oryzae Cavara)
- Also known as Magnaporthe grisea:
- Imperfect stage
- Perfect stage
- Significant economic impact, with losses ranging from 30% to 61% depending on the stage of crop infection
- Affects various parts of the rice plant: leaves, nodes, rachis, and glumes
- Leaf blast:
- Small bluish-green flecks appear on leaves
- Flecks enlarge under humid conditions, forming distinctive spindle-shaped spots with dark brown margins
- Nodal blast:
- Spots merge, leading to large areas of leaf drying and withering
- Spots also develop on the sheath
- Severely infected nodes may break, causing death of plant parts above the infected area
- Neck blast:
- Fungus attacks the peduncle during flower emergence
- Lesion turns brownish and black, referred to as neck rot or panicle blast
- Glume blast:
- Small brown to black spots develop on the glumes
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Description
Explore the impacts of the rice blast disease caused by the fungus Pyricularia grisea. This quiz covers symptoms, economic significance, and the various stages of infection in rice plants. Test your knowledge on how this disease affects different parts of rice.
