Interesting Biomechanics

[Fredward]

There are lots of cases of trees without chlorophyll in nature, but most don't survive as they can't photostynthesise, however there are some trees with root grafts onto neighbouring 'normal' trees, which can continue to grow becuase they are supported by their community..

 

Such as this albino Redwood! Of course you can't clone it becuase it will die

 

[timbernut]

Can one of you brainiacs shed some light on what caused this on sweet chestnut? There were 3 or 4 with similar growths on them alL within 4' of the ground. The DBH on this one was about 750mm but not the biggest. Also couple of pics of interesting beech and cherry. All within the park at Holkham, Norfolk. Apologies for quality as couldn't work out how to upload onto here from laptop! John

[David Humphries]

Can one of you brainiacs shed some light on what caused this on sweet chestnut? There were 3 or 4 with similar growths on them alL within 4' of the ground. The DBH on this one was about 750mm but not the biggest............

 

Perennial canker for the first image.

 

Not technically a target canker as you would see concentric annual incraments like the one below

 

http://arbtalk.co.uk/forum/tree-health-care/70372-perennial-target-other-cankers.html

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[timbernut]

Thanks for that, on the original picture you can see concentric rings.

I presume the branch that 'spawned' it would've been of a much smaller diameter, incidentally is it same/similar fungi that cause the growths that look like fresh water oyster shells on ash?

[David Humphries]

Thanks for that, on the original picture you can see concentric rings.

I presume the branch that 'spawned' it would've been of a much smaller diameter, incidentally is it same/similar fungi that cause the growths that look like fresh water oyster shells on ash?

 

infection is usually through wounds or branch stubs.

 

I would think that the pathogen that causes ash canker would be a different one than the one on your sweet chestnuts.

 

 

 

 

 

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[David Humphries]

slow decline of a large witches broom on pine

 

first shot from 2013, last shot today

 

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[treeseer]

Shade-killed?

[David Humphries]

Not really Guy, its not in direct light but not over shaded.

 

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[treeseer]

Do you think it was of no further use to the tree then?

[David Humphries]

Yellow buckeye just about holding on to life.

 

Buds forming on the remaining cambial tissue and what's left of the graft is sending down an aerial root.

 

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Edited April 28, 2016 by David Humphries