Aphids generally prefer feeding on the young, soft leaves, stems and buds, where they form colonies. Colonies of aphids clustered on young stems, leaves and buds. Aphids attack nearly all species of plants. When leaves are attacked by aphids, damage often appears first as spotty yellow discolorations, usually on the undersides of leaves, early death of young leaves and plants. Honeydew appears on blackish leaves and fruit. Aphid is a vector of virus spreaders.