This came on quite suddenly. First the bottom leaves started dying off. I didn't think much about it, shit happens. Then I noticed that it was starting to spread to upper leaves. Suspecting some kind of fungal infection (had some issues with powdery mildew etc. on cukes and tomatoes) I gave it a shot of copper. That seems to have slowed it down but it's in sad shape.
Any idea what it might be, how to treat it? I've also given it the neem treatment, along with everything else. That's been fairly useful on the powdery mildew. I'm also wondering if it might be a virus.
This is my first time growing corn. I'm still hand pollinating my dozen or so stalks, I'd like to at least get a few ears!