beech gall midge mikiola fagi, cecidomyia fagi caused by a cecidomyiidae fly on green leaf

background beech bokeh cecidomyia cecidomyiidae close closeup color czech damage detail disease ecology europe fagi fagus flora forest fresh gall garden green insect insects larva larvae leaf leaves macro midge mikiola natural nature organic outdoor parasite parasitic plant red season summer sylvatica tree