I noticed this in the potato bed the other day. I've been trying, since then, to figure out what it is. Is this Late Blight? I'm not sure. The way I would describe this is different from the descriptions I've read. I'm growing three varieties. This showed up in the red variety (Red Norland? I forget...) first, but now I see one of the German Butterball plants is affected as well. The potatoes have grown robustly all season and are currently up to my waist and flowering. If this is something that will destroy the crop I may cry. But the sooner I know, the bestter. So I'm hoping that someone more experienced/knowledgeable than I can give me a yea or nay on this. What say you?
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I am not an expert, but I don't think that's blight. Check out the photo at http://is.gd/12dcz
Thanks Fluffymuppet. I have seen two different types of photos for late light. Some like those at your link, and some closer to (but not exactly, perhaps) like what I've found in my garden. I'm really stumped. Whatever it is, it doesn't appear to be killing the vines- or if it is, its not doing it very fast. I'll be interested to see if the tubers are damaged.
Not sure since I'm not an expert on late blight, but it doesn't look like what mine have. At least if it stays like that. Things seem to progress pretty fast with late blight. If you let it stay on long enough (which is just a day or two here) it will get white fuzz on the leaf. If you never get that fuzz it won't be late blight.
I don't want to scare you, but isn't it similar to potato plague?...
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