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Q.
White spots seen on mustard leaves are due to a
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a
yeasts
b
saprobic fungus
c
parasitic fungus
d
algae
answer is B.
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Detailed Solution
The appearance of white spots on mustard leaves is caused by a parasitic fungus called Albugo. This fungus is responsible for a disease known as white rust, which is particularly common in plants belonging to the crucifer family, including mustard.
Understanding the Disease
The white spots on mustard leaves are a result of fungal infection. These spots are typically raised and powdery in texture. They indicate the presence of fungal spores, which spread rapidly under favorable conditions like high humidity and moderate temperatures.
Impact on the Mustard Plant
When Albugo infects mustard plants, it not only causes the white spots on mustard leaves but also weakens the plant. Severe infections can lead to stunted growth, reduced yield, and poor-quality produce. This makes early identification and management critical to protecting mustard crops.
Prevention and Management
To prevent and manage the occurrence of white spots on mustard leaves, follow these steps:
- Plant disease-resistant mustard varieties.
- Ensure proper spacing to improve air circulation, reducing humidity levels.
- Use fungicides recommended for controlling Albugo, applying them at the first sign of infection.
- Practice crop rotation to minimize the buildup of fungal spores in the soil.
Conclusion
The presence of white spots on mustard leaves is a clear sign of white rust disease caused by the parasitic fungus Albugo. Recognizing and addressing this issue promptly is essential for maintaining healthy mustard crops and ensuring optimal yield.