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What would cause the bark to fall off a tree like this? See the squiggly markings on the trunk?

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  • This tree is alive and healthy?
    – user13580
    May 7, 2016 at 2:09
  • Something killed the cambium and phloem layers and the bark is falling off. It's dead or marginally alive due to an increasingly narrowing patch of those layers on the other side. May 7, 2016 at 3:49

1 Answer 1

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Death.

The tree has been beetled to death, or beetles have come and munched on it after it died.

https://en.wikipedia.org/wiki/Bark_beetle

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  • 1
    If it is an ash tree then it is likely the emerald ash borer
    – kevinskio
    May 7, 2016 at 2:41

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