fungal diseases

• a type of fungal disease is rose black spot
• rose black spot is a fungus that causes purple or black spots to develop on the leaves of rose plants - the leaves then turn yellow and drop off
• when the leaves turn yellow, less photosynthesis happens, so the plant doesn't grow very well
• it spreads through the environment in water or by the wind
• gardeners can treat the disease using fungicides and by stripping the plant of its infected leaves - these leaves then need to be destroyed so that the fungus can't be spread to other rose plants