I'm always on the lookout for any new thoughts on diseases that affect maples and how to treat them, when I saw this article that showed that it is not important to pick up and burn to prevent infection for the following season. Are your maple leaves dotted with black spots? They’re called ‘tar spots’ and here’s what they mean Don't know whether I would risk it, as it goes against every bit of advice I have obtained over the decades. But maybe worth a try!!!