Unusual Leaf Miner

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More typical leaf miner “trails” look like the ones above in a catalpa leaf.

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 Obviously, this poison ivy plant stood out with such an unusual leaf miner design.

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A leaf miner is the larva of an insect that lives and develops inside a leaf. This type of mine is called a “blotch mine.” Mornings it looked like it had condensation in the mine, that wasn’t there in the evenings.

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If you look close, you can see a tiny larva.

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I was actually able to easily identify it online. It’s a poison ivy leaf miner (Cameraria guttifinitella).

The cause of the dark spots or the long crease of the upper surface remain a mystery.

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6 responses to this post.

  1. The leaf mine in your first photo is Phyllocnistis populiella, and it is a cottonwood leaf rather than a catalpa leaf.

    Reply

  2. I’ve been seeing a lot of this on maple leaves this year but haven’t been able to identify the culprit.

    Reply

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