infectious diseases in plants

• Tobacco mosaic virus (TMV)

  A very widespread plant infection that affects a number of different plant species including tomatoes
• Rose black spot


  A fungal plant disease
• Causes of rose black spot

  1. Spread by water

  2. Spread by wind
• You will find plenty of questions on infectious plant diseases in the revision workbook
• what does tmv cause leaves to look like

  discolour in mosiac pattern becuase of this discolouration rate of photosynthesis is reduced
• what does rose black spot cause rate of photosynethesis to do

  causes the rate of photosynthesis to fall and reduce growth
• how can we treat rose black spots

  we can spray the plants with fungicides or we can remove infected leaves and destroy them