Currant-sowthistle aphid (Hypermyzus lactucae) is up to 2.7mm long and green, with pale legs. The eggs hatch in March or April. By May large colonies of aphids can develop on currants. Currant-sowthistle aphid colonies die out on currants during May and June and winged forms migrate to the summer host sowthistle (Sonchus spp.) where they form colonies during the summer months. In the autumn there is a return migration to currants where mating occurs and overwintering eggs are laid in the bud axils.
Currant blister aphid (Cryptomyzus ribis) are pale yellow and live on the underside of the leaves where they feed by sucking sap. Where they feed a puckering, distortion and reddish discolouration often develops. Wingless forms of the blister aphid are active on currants from bud burst until July. In midsummer, winged aphids develop and migrate to the wild flower known as hedge woundwort (Stachys sylvatica). Infestations on currants come to an end at that time, although damaged foliage remains visible until leaf fall. The aphids return to currants in the autumn when overwintering eggs are laid.
Permanent currant aphid (Aphis schneideri) reaches 2.2mm in length and is black. Eggs hatch in spring and colonies soon develop on shot tips. As the common name suggests this aphid can be present on currants all year although winged forms are produced in the summer these migrate to other currants.