Diptera: Cecidomyiidae - gall midge Harmandiola globuli Photographs on Populus tremula, Aspen Hosts: Populus alba, canescens, tremula Thin-walled galls approx 2.5mm diameter with thick or slightly collared necks. Dull reddish-yellow often becoming blackened. One generation a year, each gall containing a single yellow-orange larva Similar: Harmandiola tremulae occurs on the same hosts but galls are 3-4mm diameter with thick walls

Harmandiola globuli
Broomhill, Dorset. October 2015