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Old 29-07-12   #1 (permalink)
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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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Old 29-07-12   #2 (permalink)
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Re: Odd willow stem...

Stereum rugosum?
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Old 30-07-12   #3 (permalink)
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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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Old 30-07-12   #4 (permalink)
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Re: Odd willow stem...

Interested to hear what a more detailed inspection discloses
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Old 30-07-12   #5 (permalink)
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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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Old 31-07-12   #6 (permalink)
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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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Old 31-07-12   #7 (permalink)
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Could be looking at the pics, though in the flesh that didn't seem right?
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