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Questions and Answers
What is the primary causal organism of bacterial blight in rice?
Which symptom is NOT characteristic of bacterial blight in rice?
What method helps reduce the spread of bacterial blight in rice cultivation?
How does the bacteria Xanthomonas orzyae primarily infect healthy rice plants?
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Which control method is recommended for managing bacterial blight in rice?
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Study Notes
Bacterial Blight of Paddy (Rice)
- Caused by the bacterium Xanthomonas orzyae
- Affects rice plants (Oryza sativa)
- Early symptoms: Water-soaked, translucent spots on lower leaves
- As spots enlarge: Form yellow to white elongated streaks
- Characteristic symptoms:
- Leaf tips dry
- Leaf blades roll inward and twist
- Bacteria oozes from lesions under humid conditions
- Bacteria blocks vascular tissues leading to blight
- Diseased rice fields have a burnt appearance
- Diseased grains turn black
- Bacterium is small, rod-shaped with a single polar flagellum
- Gram-negative and does not produce spores
- Spread through seeds, crop stubble, and nearby Cynodon dactylon
- Infected plants release secondary inoculum through lesions
- Spread via rain splashes and insects
- Enters healthy plants through stomata and wounds
- Control measures:
- Use disease-free seeds and resistant varieties (e.g., W 529 and W 348)
- Practice crop rotation
- Use chlorinated irrigation water
- Apply fungicides and antibiotics
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Description
Test your knowledge about Bacterial Blight of Paddy, caused by the bacterium Xanthomonas orzyae. This quiz covers symptoms, spread, and control measures related to this devastating rice disease. Understand how it affects rice plants and learn effective management strategies.
