rosy apple aphid (dysaphis plantaginea) on the underside of a curled apple leaf. a colony of various larval stages.

green leaf plant nature flower water grass moisture dew drop invertebrate insect frost branch produce petal tree apple aphids infected plantaginea infested infestation radicola radicicola dysaphis leaves parasitic treatment prevention agricultural aphis control orchard rosy sick affected growth pest biology agriculture macro environment bug garden aphid stem insecticide problem closeup colony protection disease louse pathology gardening parasite damage pesticide underside curled various larval stages wingless leaf stages wingless