Diptera: Cecidomyiidae - gall midge Dasineura fraxini Photographs on Fraxinus excelsior, Ash Hosts: Fraxinus angustifolia, excelsior, ornus One or many swollen pouches are formed on the underside of the main leaf vein, each pouch containing a single yellow larva. Usually one generation a year, the pupae hibernating in the soil.

Dasineura fraxini
Wimborne and Randalls Hill, Dorset. September 2017, June 2018