The larva of the fly Aulagromyza heringii mines the leaves of Ash producing an upper surface linear mine, later becoming a blotch. The mine turns black as it ages.
Where Ash is present.
The larval mines may be seen when the host species, Ash, is in leaf.
Local in Britain.
Rare or under recorded in Leicestershire and Rutland.
Leicestershire & Rutland Map
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