3.4 - Communicable Disease (Protists and Fungi)

• Are fungi unicellular, multicellular, or can they be either?

  Can be either
• What is the name of the fungal disease that causes black spots on leaves?

  Rose black spot
• What does the rose black spot fungus cause on leaves?

  It causes purple or black spots to develop
• How does rose black spot affect the growth of plants?

  It reduces photosynthesis and plant growth
• How can rose black spot be spread?

  By water or wind
• What is a common treatment for rose black spot?

  Spraying infected plants with fungicides
• What is another method to manage rose black spot aside from fungicides?

  Destroying affected leaves
• What are the symptoms of rose black spot disease?

  • Purple or black spots on leaves
  • Yellowing of leaves
  • Premature leaf drop
• What are the steps to treat rose black spot effectively?

  1. Identify infected plants
  2. Spray with fungicides
  3. Remove and destroy affected leaves
  4. Monitor for further symptoms
• What type of organism causes rose black spot?

  Fungus
• What environmental factors contribute to the spread of rose black spot?

  Moisture and wind
• What happens to leaves affected by rose black spot over time?

  They turn yellow and drop off
• If a gardener notices rose black spot, what should they do first?

  Identify and confirm the disease
• What are the consequences of not treating rose black spot?


  • Reduced plant vigor
  • Increased susceptibility to other diseases
  • Potential death of the plant
• Protists are considered parasites.

  This means that they live on, or in, a host organism, and get their food at the expense of the host.
• The organisms that cause malaria are protists
• Protists carrying malaria are transported between hosts by mosquitoes
• What are the symptoms of malaria?

  Recurrent fevers and headaches, can be fatal