That sucks...sorry to hear that. Any disease is a major pain in the ass, no matter the crop!
<knock on wood>
I've never had too much of an issue with it. I prune all suckers until the plants get to about 7' tall, then I let them go (usually by the middle of July or thereabouts). I also space them pretty well, so those two things together help with airflow and keeping the plants relatively dry. The leaves at the bottom always get some sort of blight as the season goes along, but I try to prune them when I can to help keep it from spreading.