When raking up some leaves today I came to a pile of sycamore leaves. Most of these have black spots on them. My question is: Is it ok to add them to my leaf compost heap? Or is this a fungus that will infect plants where the leaf-mould is used?
However, an efficient compost heap that heats up and rots down the leaves carrying the fungus-infected spots will destroy the spores. Spores are more likely to be transferred by uncomposted leaves left lying on the ground.
Though unsightly, tar spot is not a severe disease and only affects sycamore.