beech leaf infested by red beech gall midges larves, pest, close up

animals background beangall beech blister bugs damage detail disease diseased environment fagus forest gall galls green infected infested insect insects larva leaf leaves malus meadsweet micrococcus microcosm midge mikiola mite nature outdoors parasite parasitic pathogen pathogenic pest phyllocoptes plant pontania procontarinia red small spot spread surface sylvatica symptom tree virus