Infectious Diseases in Plants

• What are the two infectious diseases in plants discussed in the video?

  Tobacco mosaic virus and rose black spot
• What are the causes and symptoms of tobacco mosaic virus?

  • Cause: Viral infection (tobacco mosaic virus)
  • Symptoms:
  • Leaves discolor in a mosaic pattern
  • Reduced rate of photosynthesis
  • Reduced growth of the plant
• What are the causes and symptoms of rose black spot?

  • Cause: Fungal infection (rose black spot)
  • Symptoms:
  • Leaves develop purple or black spots
  • Leaves turn yellow and fall off
  • Reduced rate of photosynthesis
  • Reduced growth of the plant
• How does tobacco mosaic virus affect plant growth?

  It reduces the rate of photosynthesis, which decreases plant growth.
• How does rose black spot affect plant growth?

  It reduces the rate of photosynthesis, leading to decreased plant growth.
• What are the methods to treat rose black spot?

  • Spray plants with fungicides
  • Remove and destroy infected leaves
• What is the role of fungicides in treating rose black spot?

  Fungicides kill the fungi causing the disease.
• How can rose black spot be spread?

  It can be spread by water or wind.