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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.
Damage caused by sempervivum leaf miner. Image: RHS
Sempervivum leaf miner is a hoverfly that as a larva mines the leaves of Sempervivum species.
You may see the following symptoms:
Over-watering or poor drainage can cause similar symptoms to sempervivum leaf miner, however closer examination should reveal the presence of plump whitish maggots, up to 8-10mm (about 3/8in) long, inside some of the damaged leaves.
The adult fly is 8-10mm (approx. 3/8in) long and is black with short whitish hairs on the thorax and abdomen. Eggs are laid on the foliage of house leeks in late spring to early summer, with a second generation in late summer.
After hatching, the larvae bore into the outer leaves and eat out the internal tissues. Each larva will mine several leaves before it is fully fed and ready to pupate in the soil.
Adults of the second generation emerge in July to August and further larval feeding occurs in August to September. This pest overwinters as pupae in the soil.
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