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29-07-12
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#1 (permalink) |
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Senior Member, Raffle sponsor 2010
Join Date: Aug 2010
Posts: 1,552
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Odd willow stem...
As above, strange stem form on salix at Colchester zoo. It's almost like its grown against something long since removed, causing a flat, circular depression in the stem, with 'ears'. But it hasn't. Not right for a target canker either, no necrosis. Looks fairly normal when viewed from the other side.
   Apologies for poor quality phone pics and finger blur! So, any suggestions? |
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29-07-12
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#2 (permalink) |
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Senior Member
Join Date: Apr 2012
Location: Kent
Posts: 842
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Re: Odd willow stem...
Stereum rugosum?
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30-07-12
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#3 (permalink) |
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Senior Member, Raffle sponsor 2010
Join Date: Aug 2010
Posts: 1,552
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Maybe, although I'd expect to see fruit bodies by the time symptoms are so pronounced. Also (I didn't get up close, the wife finds me embarrassing enough as it is
 ) Butin says it only forms the canker on Quercus. I think the bark in the centre of the depression was still alive as well. I have a gold card so will be there again some point, will have a closer look 
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30-07-12
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#4 (permalink) |
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Senior Member
Join Date: Apr 2012
Location: Kent
Posts: 842
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Re: Odd willow stem...
Interested to hear what a more detailed inspection discloses
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30-07-12
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#5 (permalink) |
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Senior Member, Raffle sponsor 2010
Join Date: Aug 2010
Posts: 1,552
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A prod and probe and plenty of photos
I'll try and remember to take a proper camera too...
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31-07-12
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#6 (permalink) |
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Senior Member, Raffle Sponsor 2009, 2010, 2012
Join Date: Jul 2008
Location: Suffolk
Posts: 619
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Re: Odd willow stem...
It could just be adaptive growth following a partial stem failure caused by mechanical or other physical damage.
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