Dip:Syrphidae
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Cheilosia caerulescens (Meigen, 1822)
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mined leaves

 

Food Plant: Sempervivum tectorum (Common houseleek), S. arachnoideum (Cobweb houseleek) and S. montanum (Mountain houseleek)

Mine: May-June, August-September

Notes: The outer leaves of rosettes of affected plants become greyish or brownish-green (as shown) and then become limp and dry up. The larva (two larvae are shown) exits a leaf, near its base, to move to another leaf to feed or pupate in the soil leaving a hole, . First discovered in Surrey in 2006, presumably from imported plants (Collins,G & Halstead,A (2008) Diperists Digest, 15, 23-26). It is slowly spreading in the UK, reaching Norfolk in 2013.

Data: 2008, RHS Wisley, Surrey, VC17

Image:© RHS/Andrew Halstead

sponsored by Colin Plant Associates (UK) LLP/Consultant Entomologists

www.leafmines.co.uk