Just took these today at local park/arboretum its a
E. peltata sb dimorpha growing on a slope of about 10' blew over 2 nights ago.
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Point of interest is the cause..girdling root.
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The tree had an unusual crown in as much as it was very unbalanced, the wind seems to have caught this asymmetry and rotated the tree away from the girdling root snapping it at the stem. There being no well formed buttress roots on that side the tree has fallen away under the wind loading.
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There is also clear signs of decay, nectrotic tissue, I dug around there to expose the fibres, and some very small white pocket rot which hasnt come out very well on the photo.
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Shame to lose this tree was an attractive specimen, and one I had assessed, wish I could say I'd spotted the girdling root but I didn't
We've got another three windthrows to clean up tomorrow so will post some pics if they're of interest.
SF