red currant blister aphid cryptomyzus ribis on leaf.

red currant blister aphid cryptomyzus ribis leaf ant caring for colony aphids parasite problem agricultural aphid aphids background blister branch broken bush close close-up closeup cryptomyzus ribis currant damage disease gall gallic garden green illness infected insect isolated leaf leaves macro natural pathology pest plant red ribes rubrum sick sickness spot spring summer up upper side warts white