leaves of ulmus glabra hudson

aculus brevipunctatus aceria campestricola phytopathology pathogen broken gall aphid shriveled currant curled rolled elm tetraneura ulmi sack sackgall elmgrass european leafcurl byrsocrypta eriosoma schizoneura elmcurrant damage scotch colony deformed pest disease green aphidoidea parasite ulmus symptom plant foliage garden leafs tree branches foliave leaves ulmaceae scots wych glabra hudson infested aphids