Rose black spot

• Rose black spot is caused by a fungus
• This causes the leaves to develop purple of black spots.
• The leaves then often turn yellow and fall off.
• Rose black spot causes the rate of photosynthesis to fall and this reduces the rate of growth.
• Rose black spot fungus can be spread by water or by wind
• We can spray the plants with chemicals which kill fungi (fungicides)
• We can remove the infected leaves and destroy them.