Infectious Diseases in Plants

• What should you be able to describe by the end of the video?

  Causes and symptoms of infectious diseases
• What are the two infectious diseases in plants discussed?

  Tobacco mosaic virus and rose black spot
• Why is it important to learn about specific plant diseases?

  They could be asked in your exam
• What is tobacco mosaic virus also known as?

  TMV
• What types of plants can TMV infect?

  A number of different plant species
• What effect does TMV have on leaves?

  Causes discoloration in a mosaic pattern
• How does TMV affect photosynthesis?

  It reduces the rate of photosynthesis
• What is the consequence of reduced photosynthesis due to TMV?

  Growth of the plant is also reduced
• What is the second plant disease discussed?

  Rose black spot
• What causes rose black spot?

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

  Develop 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?

  Spray with fungicides or remove infected leaves
• What are chemicals that kill fungi called?

  Fungicides
• What should you do with infected leaves from rose black spot?

  Remove and destroy them
• Where can you find more questions on infectious plant diseases?

  In the vision workbook
• What are the causes and symptoms of tobacco mosaic virus?

  • Caused by a virus
  • Symptoms: discoloration in a mosaic pattern
  • Reduces rate of photosynthesis
  • Reduces growth of the plant
• What are the causes and symptoms of rose black spot?

  • Caused by a fungus
  • Symptoms: purple or black spots on leaves
  • Leaves turn yellow and fall off
  • Reduces rate of photosynthesis and growth
• What are the treatment methods for rose black spot?

  • Spray with fungicides
  • Remove and destroy infected leaves