15.004 Alder Stilt (Caloptilia elongella) feeding signs on Common Alder, Milner Royd drain, Sept. 16th 09. First the larva creates an upperside, elongated, silvery blotch, then it leaves the mine and rolls the leaf edge downwards to feed in.
15.004 Alder Stilt (Caloptilia elongella) tenanted mine in Common Alder at Tag Loop, July 19th 2019. The mine starts as a fine gallery as shown here and then opens up in to a silvery blotch.
15.004 Alder Stilt (Caloptilia elongella) leaf fold, July 29th 2019. Details above. After the mining stage was completed the larva spun most of the leaf edge over despite being only 4mm long.
15.006 Rufous Stilt (Caloptilia rufipennella), a rolled leaf tip and two blotch mines on Sycamore, Bankhouse wood, June 19th 2014.
15.006 Rufous Stilt (Caloptilia rufipennella), a 6mm long blotch mine in Sycamore, Bankhouse wood, June 12th 2014.
15.006 Rufous Stilt (Caloptilia rufipennella), July 7th 2014. Reared from the larva in the rolled leaf edge pictured above.
15.007 Azalea Leaf-miner netted after dusk in my garden at Skircoat Green on Aug. 3rd 2019. Apparently quite a rare, introduced species to the UK, probably overlooked though as one of the more commoner alchimiella/ robustella group.
15.008 Oak Stilt (Caloptilia alchimiella) mines and feeding signs on oak, Crimsworth Dean, Hardcastle Crags, Aug. 18th 2012. There are two vacated mines made by separate larvae, one of which has gone on to make the neat, cone shaped fold at the leaf tip to feed in.
15.008 Oak Stilt (Caloptilia alchimiella), a folded leaf edge, Aug. 22nd 2012, details above. A few minutes after introducing the larva to a fresh leaf it rapidly began to spin the leaf edge over. Countless threads of silk are spun which, as they begin to dry, contract thereby pulling the leaf edge over.
15.008 Oak Stilt (Caloptilia alchimiella), cocoon under a spun leaf edge. Details above. After nearly four weeks the larva has finally spun up to pupate. The subsequent pupa was identified by Willem Ellis as being of this species and not the similar Caloptilia robustella.
15.008 Oak Stilt (Caloptilia alchimiella) pupa, Apr. 27th 2013. Details above. After spending the winter in the garage in an airtight tuppaware box the pupa was brought indoors on Apr. 4th. Just over three weeks later it has begun to colour up nicely shortly before emergence.
15.008 Oak Stilt (Caloptilia alchimiella), Apr. 30th 2013. Freshly emerged from the pupa pictured above.
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15.010 Willow Stilt (Caloptilia stigmatella), a rolled leaf tip on Grey Willow at Milner Royd nature reserve on June 9th 2020.
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Two of them had these more subdued colours.
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Only discovered in Britain as recently as 2019 in Folkestone, Kent. It is now spreading rapidly northwards with several records in Yorkshire.
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After the larva had left the mine pictured above a fresh leaf was put in and it soon began the second phase of its development by spinning the leaf edge over.
15.014 Garden Stilt (Gracillaria syringella) mine in Privet in my garden at Skircoat Green, June 6th 2014.
15.014 Garden Stilt (Gracillaria syringella) a tightly rolled leaf on garden Privet, June 6th 2014. Several days later when opened up to move the occupants to a fresh leaf there were four larvae present.
15.014 Garden Stilt (Gracillaria syringella), June 28th 2014. Reared from a larva in the leaf fold pictured above.
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15.014 Garden Stilt (Gracillaria syringella), a mating pair, North Dean wood, May 16th 05. A field observation.
15.015 Ribwort Stilt (Aspilapterix tringipennella) mine (centre) in Ribwort Plantain, Tag meadow, Apr. 21st 2014. Mines seem to be a lot more readily found here than in many other areas in Calderdale.
15.015 Ribwort Stilt (Aspilapterix tringipennella), May 5th 2014. Reared from larvae found in mines on Ribwort Plantain at Tag Loop (see above).
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Initial larval galleries eventually coalesce to form large, silvery blotches on the upperside of the leaf.
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