A brief description of Anthracnose is a fungal foliar disease to which sycamore, oak (especially white), and maple are highly susceptible. This fungus will cause defoliation. The onset of symptoms usually occurs from May to mid-June.
The other disease is Fireblight which is a bacterial disease that causes wilting and blackening of blossoms and leaves on trees. This disease occurs early in the season and can produce symptoms that persist throughout the summer. The first sign of firelight occurs May through early June depending on your geographic location.
Check back tomorrow for more detailed information on Anthracnose and Fireblight. I'll discuss prevention and treatment.