Plant Parasites of Europe

leafminers, galls and fungi

Prays peregrina

Prays peregrina Agassiz, 2007

london ermel


de mine starts at an lower-side, transparant egg shell (it is not filled with frass), in about the centre of the leaf. The young larva makes a very irregular, shallow upperside gallery. After its fist moult it leaves this forst mine through an exit hole in the upper epidermis. Subsequently 2 or 3 leaves are mined out, gradually deeper and more completely, the larve protruding from the mine with its rear end. At the latest stage the larva lives completely free, and pupates among spun leaves.

host plants

Rutaceae, monophagous

Ruta chalepensis, graveolens.


Mining larvae were seen end October; this might be a second generation.


The species was described by Agassiz in 2007, on the base of several moths captured in the Greater London area. It was evidently an exotic species, an its origin could not be established Almost ten years later mines and larvae were discovered by Colin Plant in the same region, and bred through. Assuming that indeed Ruta chalepensis is the normal host plant of the species, it must be home in the Mediterranean region.


An observation by Beavan shows that the species probably is multivoltine.

larva, pupa

Pictures in Plant’s and Beavan’s paper.


Agassiz (2007a), Beavan (2017a), Falck & Karsholt (2019a), Marabuto (2022a), Plant (2016a).

Last modified 21.i.2023