Season (Adult / Immature):
National Status: Local
Local Status: Rare and very local resident.
Local Record: Grade 4 adult, 4 leaf-mine See here for explanation
|Year first recorded||1858||1976||1883|
|Year last recorded||1883||2012||1883|
|Number of records||2||6||2|
|Number of individuals||0||3||0|
For the county, we have a total of 10 records from 10 sites. First recorded in 1858.
Most records are of leaf-mines.
2013 (CHF): Separation of the two alder-mining Stigmella species is fraught with difficulty and some of the dots on the map could be mis-identifications. The egg is laid on the underside of the leaf, always against a vein. The mine is a slender corridor and there may be several in a single leaf. The frass line is variable and typically occupies a third to half of the width. It is sometimes coiled. The larvae are darker yellow than those of alnetella and have a distinct prothoracic spot which is absent in alnetella. The Dutch site www.bladmineerders.nl say that vacated mines cannot be separated without seeing the larvae but then go on to say that alnetella never shows coiled frass.