A review of the literary data on the life cycles and host plant relationships of Aphis grossulariae Kaltenbach, A. schneideri (Börner) and A. triglochinis Theobald is presented. Morphometric analysis of the three species revealed insufficient discriminative value of the majority of characters commonly used in the keys. A modified key to fundatrices, apterous and alate viviparous females, gynoparous and oviparous females and males is presented.