Looked at the Frangula alnus and fairly quickly I located the now long-vacated small spiral mines of what I eventually found out to be Bucculatrix frangutella, the Buckthorn Bent-wing, on quite a few of the leaves. This seems to me to be a delightful oddity. When does the larva decide to straighten its mine out, generally to be followed shortly by its leaving of the mine entirely, and conversion to the habit of window-paning the leaves!
Low down on one particular bush there also appeared to be a lot of window-paning, possibly caused by the further feeding of the larvae.
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