Pest description and damage Bean aphids are soft-bodied, dark green to black insects with lighter color legs. They are commonly found on the undersides of leaves and on new growth, often in dense colonies. Heavy aphid feeding may distort shoot tips and leaves, and leaves may turn yellow, wilt, or show other signs of stress. Typically, bean aphids produce large amounts of honeydew-a sweet, sticky material. This material can attract honeydew-feeding ants, and yellowjackets, which protect aphid colonies from predators. Honeydew also may become covered with a dark, unsightly growth of sooty mold. Viburnum is a winter host for this aphid, which may be found on various vegetables in the summer, including beans, lettuce, and squash. The aphid does not attack Viburnum davidi.
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