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Photo#1466740
Blotch mines on weeping willow - Isochnus sequensi

Blotch mines on weeping willow - Isochnus sequensi
Fredericton, York County, New Brunswick, Canada
October 12, 2016
Dark blotch mines, look rather beetle-like, on leaves of Weeping Willow, riverside, bordered by a city park.

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Blotch mines on weeping willow - Isochnus sequensi Blotch mines on weeping willow - Isochnus sequensi Blotch mines on weeping willow - Isochnus sequensi Blotch mines on weeping willow - Isochnus sequensi

Moved

Willow mines can be tough...
my first guess would be Isochnus sequensi, but hopefully you can rear these out at some point.