reddish blisters on red currant leaves caused by aphids (cryptomyzus ribis)

agriculture animal aphid aphididae aphids april berry biology blisters branch bsh bush colors currant damage dangerous deformation deformed distorted europe foliage fruit galls garden gardening green hand host plant infested insect leaves pest problem prominent puckered purple red reddish ribes rubrum show sign spring time suck symptom upper side visible woman