Mellodrama
Well-Known Member
OK, it's probably a little bit ridiculous to start a thread with such a title, but every day people post with pictures of leaf necrosis.
If I may be so bold, it appears to me that:
It's a common problem.
And necrosis can indicate several different problems, or worse, some combination of problems.
And necrosis can exhibit itself along the leaf edges, or on the broad surfaces between veins, and/or across the veins too.
And very few people are getting good answers.
Maybe we can help each other out. There have to be some clues from the necrosis patterns. I've read that some deficiencies rarely cause necrosis, such as Fe deficiency. Maybe that's true, maybe it isn't. But it seems to me that a first step would be to rule out the deficiencies that don't cause necrosis so we can focus on the ones that do.
Please post your necrotic leaf pictures into this thread, along with pertinent info. If we can get enough pictures together in one place maybe we can help each other out.
To start this thread off, here's a leaf. Underside and top side.
The sick leaves started after a flush (about 4 weeks ago) because I thought they were suffering from N tox. Growing in FFOF. I didn't fertilize after the flush because I was operating on the theory that the FFOF was too hot. At this point I'm guessing that flushing without adding some brand of "Grow" fertilizer afterward caused one or more deficiencies.
From what I've picked up it could be iron def. Or magnesium. Or sulfur or manganese or calcium. Or overall under-feeding. New growth is yellowish and tiny necrotic spots, no bigger than pinholes, can be seen.
The plants were flipped to flower a week ago. I've read that foliar feeding is a good way to do an end-run around lockout, but others say don't foliar feed once you've gone to flower.
If I may be so bold, it appears to me that:
It's a common problem.
And necrosis can indicate several different problems, or worse, some combination of problems.
And necrosis can exhibit itself along the leaf edges, or on the broad surfaces between veins, and/or across the veins too.
And very few people are getting good answers.
Maybe we can help each other out. There have to be some clues from the necrosis patterns. I've read that some deficiencies rarely cause necrosis, such as Fe deficiency. Maybe that's true, maybe it isn't. But it seems to me that a first step would be to rule out the deficiencies that don't cause necrosis so we can focus on the ones that do.
Please post your necrotic leaf pictures into this thread, along with pertinent info. If we can get enough pictures together in one place maybe we can help each other out.
To start this thread off, here's a leaf. Underside and top side.
The sick leaves started after a flush (about 4 weeks ago) because I thought they were suffering from N tox. Growing in FFOF. I didn't fertilize after the flush because I was operating on the theory that the FFOF was too hot. At this point I'm guessing that flushing without adding some brand of "Grow" fertilizer afterward caused one or more deficiencies.
From what I've picked up it could be iron def. Or magnesium. Or sulfur or manganese or calcium. Or overall under-feeding. New growth is yellowish and tiny necrotic spots, no bigger than pinholes, can be seen.
The plants were flipped to flower a week ago. I've read that foliar feeding is a good way to do an end-run around lockout, but others say don't foliar feed once you've gone to flower.
