Raised leaf galls are produced on Ribes (see picture above) which are broadly open on the underside where the aphids live. The upperside of the gall turns bright red. Cryptomyzus ribis are found throughout Europe, Asia and North America, and can be a serious pest of currant bushes. ... Cryptomyzus ribis has been recorded from 26 Ribes species

- Dransfield, Bob & Bob Brightwell: (2022) Cryptomyzus ribis: Red currant aphid^©