plant louse, louse - any of several small insects especially aphids that feed by sucking the juices from plants

Aphidoidea, superfamily Aphidoidea - plant lice

Aphis pomi, apple aphid, green apple aphid - bright green aphid; feeds on and causes curling of apple leaves

Aphis fabae, bean aphid, blackfly - blackish aphid that infests e.g. beans and sugar beets

greenfly - greenish aphid; pest on garden and crop plants

ant cow - excretes a honeylike substance eaten by ants

woolly aphid, woolly plant louse - secretes a waxy substance like a mass of fine curly white cotton or woolly threads