Infectious Diseases in Plants

• What are the two infectious diseases in plants discussed?

  Tobacco mosaic virus and rose black spot
• What types of plants can be infected by TMV?

  A number of different plant species
• What symptom does TMV cause in plant leaves?

  Discoloration in a mosaic pattern
• How does TMV affect the rate of photosynthesis?

  It reduces the rate of photosynthesis
• What is the effect of reduced photosynthesis on plant growth?

  It reduces the growth of the plant
• What causes rose black spot?

  A fungus
• What symptoms does rose black spot cause on leaves?

  Development of purple or black spots
• What happens to leaves after developing spots from rose black spot?

  They often turn yellow and fall off
• How does rose black spot affect photosynthesis?

  It causes the rate of photosynthesis to fall
• What are the two ways to treat rose black spot?

  Spraying with fungicides and removing infected leaves
• What should be done with infected leaves of rose black spot?

  Remove and destroy them
• What are the causes and symptoms of the two infectious diseases in plants?

  • Tobacco Mosaic Virus (TMV):
  • Cause: Viral infection
  • Symptoms: Mosaic pattern discoloration, reduced photosynthesis, reduced growth
  • Rose Black Spot:
  • Cause: Fungal infection
  • Symptoms: Purple or black spots, yellowing leaves, leaf drop, reduced photosynthesis, reduced growth