A Pruner, a Girdler and a ?

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We have a dawn redwood tree in our backyard

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that my mother gave us years ago. These pictures were taken the end of November.

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I found several twigs on the ground under the tree.

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What “cut” the twigs from the tree, and how did they do it to make the end look like that?

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There are tree pruner insects. A full-grown twig pruner chews through the wood from the inside out. This leaves a smooth cut on the inside of the twig. The ragged edge results from the twig breaking.

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This broken twig resulted from a female tree girdler chewing a v-shaped groove around the twig. The small larva overwintered in the fallen twig.

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The ones off the redwood tree don’t look like the work of a girdler or a pruner.

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It will probably remain a mystery … unless I find another clue in the future.

 

 

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15 responses to this post.

  1. Have you considered porcupines? They trim branches this size off evergreens and drop them to the ground.

    Reply

  2. Most interesting, I hope you solve the mystery.

    Reply

  3. Deer can’t bite cleanly through twigs and often leave a ragged edge, but only on one side of the twig, and the twig isn’t usually bigger than a pencil.

    Reply

  4. Fascinatingb but I’m of no help.

    Reply

  5. Interesting! Love a mystery!

    Reply

  6. Posted by Therese on February 9, 2016 at 1:11 pm

    How about a nickname, Kurious Kathy? (I thought the “K” worked better than “c”.

    Reply

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