Norfolk status Difficult to distinguish from the recently separated C. robustella.
The flight period is from May to July.
If uncertain, please record as the aggregate Caloptilia alchimiella/robustella
Determination by Genitalia Examination (gen. det.) Required
Leaf-mine: July - Oct. Narrow gallery leading to a squarish or triangular blotch. Then forms up to three successive cones by folding the lobe of a leaf downwards. Note: You cannot separate these from C. robustella unless you examine the pupa or breed out.
Recorded in 29 (42%) of 69 10k Squares. First Recorded in 1874. Last Recorded in 2014.