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| I have a Cosmonaut Volkov and a Cherokee Purple that look like the "giraffe" blotches on the stems from late blight, but when I scraped the spot on the CP lightly with my fingernail a week or so ago the discoloration came off, and the plant's still alive, though the CPs and BKs were looking wilted for quite a while (we did have a dry spell in July) and now have dry dead leaves. Practically all my OPs have yellow leaves and petioles, spotted leaves, dry dead leaves, I've been trying to pick all affected foliage off and get what fruit is set to blush before I pull the plants since everything is so late this year. I know I have early blight and septoria out in the field (house garden - or the Burpee hybrid beefsteaks - have not been affected). But now the same lesions on 1 CV and did not easily scrape off. The CV are almost done, fruit not affected and I've been picking for a week, they are practically defoliated from my efforts to keep up with the Septoria though. I'm going to pull them soon. But wondering if LB lesions scrape off easily or no, I'll pull every blotchy plant now, even if it has green fruit, rather than risk the Grandma Mary's and Rose de Berne that are doing so nicely (Rose is loaded, big clusters of BIG fruit but no blushing yet). Rain predicted for the weekend through Tuesday, so this is only going to get worse - have to do it now. Today's plan was to pull the cukes that have succumbed to downy mildew. TIA |
Follow-Up Postings:
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| If you're going to pull some plants anyway, you could try slicing the "trunk" of the stem vertically. If there is some hard brown material in there you could check out the pictures at: http://vegetablemdonline.ppath.cornell.edu/ Perhaps it might confirm your diagnosis. If it's LB, I believe the best thing is to pull anything that shows disease to try to stop it from spreading to other healthy plants. Linda |
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| All sorts of issues can cause lesions/blotches on stems besides Late Blight. No reason to just jump to the worst possible conclusion just based on that one symptom. Especially when LB is the least common of the possible causes. Dave. |
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| If you scraped the stem lesions a week ago, but the plants are still alive, it's not late blight. Please post pictures. |
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