How do certain tree diseases spread. Often through spores . The black or Grey spots often found on oak trees . Commonly called black spores. And that can include oak wilt , anthranose and hypoxlon canker to name a few . Watch as this tree is fell and you will see the infectious cloud of spores. Have black spots and brown leaves give me a call . Nippers tree 352 214 7080 | Darell Nipper