Can anyone identify the cause of these deformities?

[aliross]

Found these growths on ash trees I was reducing yesterday. Can anyone explain the cause please.

[arbwork]

Fasciation - Wikipedia, the free encyclopedia

[treeseer]

Fasciation - Wikipedia, the free encyclopedia

 

Or page 24 here 2011 June Arborist News

[daltontrees]

For anyone interested in fasciation, her eis an example on Ilex aquifolium from my garden. A few leaves have been taken off for ease of seeing.

[Paul Cleaver]

we should have a fasciation photographic section - Ive seen it mostly on forsythia

[daltontrees]

I haven't seen it on Forsythia, but I will henceforth be on the lookout.

 

If enough speceis susceptible to it are recorded some conclusion might e reached. so far all 3 genus mentioned are 'Asterids'. Too early for a conclusion. Any fasiating non-asterids?

[sloth]

Not sure what an Asterid is, time to go look I guess. For what it's worth I've seen it mostly on holly, but also sycamore (I think) and also on a dandelion last year (on the flower stem and actual flower) and this year on a tomato plant, extending from stems to fruits.

 

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[daltontrees]

Not sure what an Asterid is, time to go look I guess. For what it's worth I've seen it mostly on holly, but also sycamore (I think) and also on a dandelion last year (on the flower stem and actual flower) and this year on a tomato plant, extending from stems to fruits.

 

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Asterids is a taxonomic level below phylum but above order, but not as clear-cut as a class.

 

But if Sycamore fasciculates, and it's not an Asterid, then my theory lasted about 20 minutes before you killed it [boo hoo]. I want to see photographic evidence though...

 

Dandelions are asterids!

[sloth]

I think I saw it on sycamore once, many moons ago, I might not have done though! Don't give up on that there theory just yet - it seems tomatoes are asterids too, and forsythia...

 

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[timbernut]

Have sen it on sallow coppice re gen once and on ash regularly : always on coppice /pollardre re gen