Walking along the towpath of the Grand Union Canal (somewhere SW of Heath and Reach) today I spied the accompanying hedgerow had wild Hop in it and, in one area, there were leaf-mines that looked like this:
This is caused by the caterpillar of Cosmopterix zieglerella which is a relatively scarce and local moth. Indeed, although there was Hop off and on in quite a long stretch of the hedge, leaf-mines were only evident in a short portion.
It would be nice to post a picture of the adult - a very colourful moth.
It might also be worth pointing out it was very close to the border with Bedfordshire.
Andy King.
As you say, Andy, it would be nice to find the moth itself! We have about half a dozen Bucks records but all are of leaf mines on hop.
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