leaves of currants affected by currant aphids berry bush disease with bulges

currant disease leaf infected sick capitophorus ribis aphid deficiency foliage spot lack nature plant parasite damage illness weakness impairment insect pest problem fungal danger blight pests virus pathogen fungus sickness insects bacterial spots bacterium bacteria infestation viral dangerous fungi fungicide dots red blister aphids ill infection parasites destructive sap close leaves currants affected berry bush bulges