This is the 3rd or 4th wetest spring on record in Michigan, and we are just a few inches from the record, with more rain predicted. It has been cool also. I am about 30 miles from the OP.
Doing some reading on the Internet, it could be downy mildew. Not what I wanted to find out that it is. These are grown for fun, and the actual time and money that goes into it makes those the most expensive hops I brew with. I don't like it, but not going to lose any sleep over it.