Here's a link for some organic control options in case you're
interested in some alternatives to chemical controls. Haven't read all
of it myself, but when I glanced at the disease control section they
said there were no organic controls for black rot, botrytis and some
others, but I know there are some out there now. Fungastop is one that
is on the market for control of many fungal and bacterial diseases.

http://www.nysaes.cornell.edu/hort/f...fcontents.html