Sempervivum leaf miner
Sempervivum leaf miner was first recorded in southern England during 2008, it originates from mainland Europe. It has spread slowly in Britain and remains uncommon.
Scientific name: Cheilosia caerulescens
Plants affected: House leeks (Sempervivum tectorum, S. arachnoides and S. montanum)
Main symptoms: Outer leaves wilt and discolour; may contain larvae
Most active: May to June and August to September
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