Infectious Disease in Plants

• What is TMV and the cause of TMV ?

  its a widespread plant infection (can be in tomatoes ) and it causes the leaves to discolour in mosaic patterns
• What affect does the discolouration have on plants ?

  reduces the rate of photosynthesis meaning the growth of the plant is also reduced
• What is rode black spot cause by ?

  Fungus
• What does a rose black spot do ?

  cause the leaves to develop purple or black spots often then turn yellow and then fall of
• What does a rose black spot cause ?

  causes the rate of photosynthesis to fall and reduces the rate of growth
• What is a rose black spot spread by ?

  water or wind
• How to treat a rose black spot ?

  spray the infected plant with chemicals that kill fungi (fungicides)

  remove the infected leaves and destroy them