What is that?

What causes shade tree anthracnose?
ash anthracnose
                                                                  Ash anthracnose
What does it look like? What should be done about this disease?
Where can I get more information?
Frederick Berry.  1986.  "Anthracnose diseases of eastern hardwoods."  FIDL-NA-133 (product recommendations outdated).  For other information, advice and help on this topic, call offices of your State Urban Forestry Coordinator or University Extension service, or visit urban forestry web sites.