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Clara
Joined: 12 Feb 2007 Posts: 268 Location: the green green grass of wales
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gz
Joined: 23 Jan 2009 Posts: 8577 Location: Ayrshire, Scotland
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Clara
Joined: 12 Feb 2007 Posts: 268 Location: the green green grass of wales
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Slim
Joined: 05 Mar 2006 Posts: 6533 Location: New England (In the US of A)
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oliveoyl
Joined: 18 Sep 2008 Posts: 425
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Clara
Joined: 12 Feb 2007 Posts: 268 Location: the green green grass of wales
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cab
Joined: 01 Nov 2004 Posts: 32429
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gz
Joined: 23 Jan 2009 Posts: 8577 Location: Ayrshire, Scotland
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Clara
Joined: 12 Feb 2007 Posts: 268 Location: the green green grass of wales
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Clara
Joined: 12 Feb 2007 Posts: 268 Location: the green green grass of wales
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gz
Joined: 23 Jan 2009 Posts: 8577 Location: Ayrshire, Scotland
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cab
Joined: 01 Nov 2004 Posts: 32429
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Slim
Joined: 05 Mar 2006 Posts: 6533 Location: New England (In the US of A)
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Posted: Tue Apr 21, 09 3:52 pm Post subject: |
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I'm not familiar with the red leaf disease (I think it's more of a western problem), but your picture doesn't look too much like the photos of it that I've seen. It also doesn't look like the phosphorous deficiency/chilling stress that gz posted about.
To be honest, my best guess (emphasis on the guess) is sunburn. How long ago was the shade-casting willow cut down? Were the larger, now red, leaves the only ones that had come out at that point? If so, they were shade-acclimated leaves that may have gotten sunburnt when exposed to full sun. It doesn't have to be hot, so long as as it's really bright, and your plant will suffer from photoinhibition. The redness is a last-ditch defense mechanism to create red pigments that will help to absorb some of the light hitting the leaf surface. The damage to the leaf's photosynthetic processes has already occurred, and as it takes a lot of effort for the plant to repair, it will likely just let those leaves die.
If I'm right, the plant may let the damaged leaves die off, and produce smaller leaves that are better adapted to full-sun. Seeing as you're already pushing the plant a little bit to get it to grow somewhere warmer and brighter than it has evolved to be, it'd probably be a good idea to get some protective shade on it, and make sure that it's well watered! |
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Slim
Joined: 05 Mar 2006 Posts: 6533 Location: New England (In the US of A)
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Kathleen Perrelle
Joined: 31 May 2011 Posts: 5
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