Food Plant: Ulmus spp.

Mine: June-August

Notes: A gallery is formed from a vein (where the egg is laid). A blotch develops, with a dark centre (as shown), where the cocoon is formed. Mine shown is on Ulmus glabra. Adults first iscovered in Britain in Bedfordshire (Gurney & Lane (2023). Orchestes alni forms similar mines but occurs earlier in the year and is on developing leaves, which can lead to leaf distortion, whereas O.betuleti develops on mature leaves and causes no distortion.

Data: 20.vii.2014, Meerhout, (Antwerpen), Belgium

Image:© Carina Van Steenwinkel