 Spotted alfalfa aphid Spotted Alfalfa Aphid The spotted alfalfa aphid is about 2 mm long, pale yellow, and has four to six rows of dark spots on its back. It is usually found on stems and leaves on the lower portions of the plant. It sucks plant sap and secretes large amounts of honeydew. Its toxic saliva kills seedling plants and may lower the productivity of established fields. Host plants: alfalfa, clovers.
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