seeckert's picture

Bark disease on elm

Observed: 7th August 2011 By: seeckert
bark disease on elm

This young elm tree is affected by (presumably) Eriophyid mites. However, does anyone know what causes the bark to become corky (red arrow)? I've seen that phenomenon on a number of sites, and also on hawthorns. Is this a viral, bacterial or fungal infection?

  • an elm (Ulmus sp.)
    Confidence: I'm as sure as I can be.
Species interactions

No interactions present.


Chalkie's picture

Not sure

The vegetative id book, Poland and Clement, comments that both Dutch Elm (Ulmus x hollandica) and English Elm (Ulmus procera) have some twigs becoming corky, so maybe it's just normal for them, rather than caused by an infection?

cabbageleek's picture


As Chalkie suggests, it is totally normal for Elm twigs to be corky.